8 And I John saw these things, and heard them. And when I had heard and seen, I fell down to worship before the feet of the angel which shewed me these things.
9 Then saith he unto me, See thou do it not: for I am thy fellowservant, and of thy brethren the prophets, and of them which keep the sayings of this book: worship God.
V. Posture in Prayer, Veneration and Worship
Deut. 5:9 - God’s command, “you shall not bow down to them” means “do not worship them.” But not all bowing is worship. Here God’s command is connected to false worship.
Rev. 3:9 - Jesus said people would bow down before the faithful members of the church of Philadelphia. This bowing before the faithful is not worship, just as kissing a picture of a family member is not worship.
Gen. 19:1 - Lot bowed down to the ground in veneration before two angels in Sodom.
Gen. 24:52 - Abraham’s servant bowed himself to the earth before the Lord.
Gen. 42:6 - Joseph’s brothers bow before Joseph with the face to the ground.
Jos. 5:14 - Joshua fell to the ground prostrate in veneration before an angel.
1 Sam. 28:14 - Saul bows down before Samuel with his face to the ground in honor and veneration.
1 Kings 1:23 - the prophet Nathan bows down before King David.
2 Kings 2:15 - the sons of the prophets bow down to Elisha at Jericho.
1 Chron. 21:21 - Ornan the Jebusite did obeisance to king David with his face to the ground.
1 Chron. 29:20 - Israelites bowed down to worship God and give honor to the king.
2 Chron. 29:29-30 - King Hezekiah and the assembly venerate the altar by bowing down in worship before the sin offerings.
Tobit 12:16 - Tobiah and Tobit fell down to the ground in veneration before the angel Raphael.
Judith 14:7 - Achior the Ammonite kneels before Judith venerating her and praising God.
Psalm 138:2 - David bows down before God’s Holy Temple.
Dan. 2:46 - the king fell down on his face paying homage to Daniel and commands that an offering be made to him.
Dan. 8:17 - Daniel fell down prostrate in veneration before the angel Gabriel.
1 Macc. 4:40,55 - Judas and the faithful fell face down to the ground to praise heaven and worship God.
2 Macc. 10:4,26; 13:12 - Maccabeus and his followers fall down prostrate praying to God.
9 Then saith he unto me, See thou do it not: for I am thy fellowservant, and of thy brethren the prophets, and of them which keep the sayings of this book: worship God. "
Also I would say the angel might of known or wanted to make sure he was Not worshiping.