Replies

There are several passages in the scriptures concerning prayers for the dead, which I may post as well, but these passages are commonly overlooked, and since the case is irrefutable that the Jews have commonly and persistently prayed for the dead, I am responding with passages in the Old Testament, sans Second Maccabbees, that can be read in support of this ancient custom.

And this is the blessing, wherewith Moses the man of God blessed the children of Israel before his death. And he said, The Lord came from Sinai, and rose up from Seir unto them; he shined forth from mount Paran, and he came with ten thousands of saints: from his right hand went a fiery law for them. Yea, he loved the people; all his saints are in thy hand: and they sat down at thy feet; every one shall receive of thy words. Moses commanded us a law, even the inheritance of the congregation of Jacob. And he was king in Jeshurun, when the heads of the people and the tribes of Israel were gathered together. Let Reuben live, and not die; and let not his men be few. And this is the blessing of Judah: and he said, Hear, Lord, the voice of Judah, and bring him unto his people: let his hands be sufficient for him; and be thou an help to him from his enemies. And of Levi he said, Let thy Thummim and thy Urim be with thy holy one, whom thou didst prove at Massah, and with whom thou didst strive at the waters of Meribah; Who said unto his father and to his mother, I have not seen him; neither did he acknowledge his brethren, nor knew his own children: for they have observed thy word, and kept thy covenant. They shall teach Jacob thy judgments, and Israel thy law: they shall put incense before thee, and whole burnt sacrifice upon thine altar. Bless, Lord, his substance, and accept the work of his hands; smite through the loins of them that rise against him, and of them that hate him, that they rise not again. And of Benjamin he said, The beloved of the Lord shall dwell in safety by him; and the Lord shall cover him all the day long, and he shall dwell between his shoulders. And of Joseph he said, Blessed of the Lord be his land, for the precious things of heaven, for the dew, and for the deep that coucheth beneath, And for the precious fruits brought forth by the sun, and for the precious things put forth by the moon, And for the chief things of the ancient mountains, and for the precious things of the lasting hills, And for the precious things of the earth and fulness thereof, and for the good will of him that dwelt in the bush: let the blessing come upon the head of Joseph, and upon the top of the head of him that was separated from his brethren. His glory is like the firstling of his bullock, and his horns are like the horns of unicorns: with them he shall push the people together to the ends of the earth: and they are the ten thousands of Ephraim, and they are the thousands of Manasseh. And of Zebulun he said, Rejoice, Zebulun, in thy going out; and, Issachar, in thy tents. They shall call the people unto the mountain; there they shall offer sacrifices of righteousness: for they shall suck of the abundance of the seas, and of treasures hid in the sand. And of Gad he said, Blessed be he that enlargeth Gad: he dwelleth as a lion, and teareth the arm with the crown of the head. And he provided the first part for himself, because there, in a portion of the lawgiver, was he seated; and he came with the heads of the people, he executed the justice of the Lord, and his judgments with Israel. And of Dan he said, Dan is a lion's whelp: he shall leap from Bashan. And of Naphtali he said, O Naphtali, satisfied with favour, and full with the blessing of the Lord: possess thou the west and the south. And of Asher he said, Let Asher be blessed with children; let him be acceptable to his brethren, and let him dip his foot in oil. Thy shoes shall be iron and brass; and as thy days, so shall thy strength be. There is none like unto the God of Jeshurun, who rideth upon the heaven in thy help, and in his excellency on the sky. The eternal God is thy refuge, and underneath are the everlasting arms: and he shall thrust out the enemy from before thee; and shall say, Destroy them. Israel then shall dwell in safety alone: the fountain of Jacob shall be upon a land of corn and wine; also his heavens shall drop down dew. Happy art thou, O Israel: who is like unto thee, O people saved by the Lord, the shield of thy help, and who is the sword of thy excellency! and thine enemies shall be found liars unto thee; and thou shalt tread upon their high places.

But as for me, when they were sick, my clothing was sackcloth: I humbled my soul with fasting; and my prayer returned into mine own bosom. I behaved myself as though he had been my friend or brother: I bowed down heavily, as one that mourneth for his mother.

And David said unto Nathan, I have sinned against the LORD. And Nathan said unto David, The LORD also hath put away thy sin; thou shalt not die. Howbeit, because by this deed thou hast given great occasion to the enemies of the LORD to blaspheme, the child also that is born unto thee shall surely die. And Nathan departed unto his house. And the LORD struck the child that Uriah's wife bare unto David, and it was very sick. David therefore besought God for the child; and David fasted, and went in, and lay all night upon the earth. And the elders of his house arose, and went to him, to raise him up from the earth: but he would not, neither did he eat bread with them. And it came to pass on the seventh day, that the child died. And the servants of David feared to tell him that the child was dead: for they said, Behold, while the child was yet alive, we spake unto him, and he would not hearken unto our voice: how will he then vex himself, if we tell him that the child is dead? But when David saw that his servants whispered, David perceived that the child was dead: therefore David said unto his servants, Is the child dead? And they said, He is dead. Then David arose from the earth, and washed, and anointed himself, and changed his apparel, and came into the house of the LORD, and worshipped: then he came to his own house; and when he required, they set bread before him, and he did eat. Then said his servants unto him, What thing is this that thou hast done? thou didst fast and weep for the child, while it was alive; but when the child was dead, thou didst rise and eat bread. And he said, While the child was yet alive, I fasted and wept: for I said, Who can tell whether GOD will be gracious to me, that the child may live? But now he is dead, wherefore should I fast? can I bring him back again? I shall go to him, but he shall not return to me.
Deuteronomy, Catholic chapter thirty three, in its entirety,
Psalms, Catholic chapter thirty five, Protestant verses thirteen to fourteen,
Second Samuel Catholic chapter twelve, Protestant verses thirteen to twenty three,
as authorized, but not authored, by King James

If you look at the blessings for the children Israel, there are tribal references and yet there are also personal references to the actual sons of Jacob. All of them were dead at this time.
Notice Moses asking, ie., praying that Reuben, who was already dead, should live and not die. His subsequent prayer that "and let not his men be few" is a clearly reference to the tribe. Nothwithstanding Reuben conspiring to sell his brother into slavery, he is also mentioned in Jacob's prophecy as having defiled his father's bed, both sins into death.
If you look at Judah, "Hear, Lord, the voice of Judah, and bring him unto his people" can also be read to apply to Judah himself. Judah also had a couple of deadly sins mentioned in the text of Genesis.
In the psalm, there is a reference to prayer and fasting as if one were mourning for one's mother, even though David was praying for wicked enemies who were sick, yet still alive. However, mourning for a mother, and any prayers, would be for the dead.
The reference to Second Samuel is unusual, but worth considering as the David's son was killed by the word of the LORD to punish David and the child died before he could be circumcised. So David prays for the child, fasting and mourning. After the child dies, David goes into the tabernacle and worships, including prayer of course. When he comes out he says that he will go to the child (when David dies).