Mark 10
17 And when he was gone forth into the way, there came one running, and kneeled to him, and asked him, Good Master, what shall I do that I may inherit eternal life?
18 And Jesus said unto him, Why callest thou me good? there is none good but one, that is, God. Thou knowest the commandments, Do not commit adultery, Do not kill, Do not steal, Do not bear false witness, Defraud not, Honour thy father and mother.
Mark 12
28 And one of the scribes came, and having heard them reasoning together, and perceiving that he had answered them well, asked him, Which is the first commandment of all?
29 And Jesus answered him, The first of all the commandments is, Hear, O Israel; The Lord our God is one Lord:
30 And thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this is the first commandment.
Luke 1
5 THERE was in the days of Herod, the king of Judaea, a certain priest named Zacharias, of the course of Abia: and his wife was of the daughters of Aaron, and her name was Elisabeth.
6 And they were both righteous before God, walking in all the commandments and ordinances of the Lord blameless. Luke 18
19 And Jesus said unto him, Why callest thou me good? none is good, save one, that is, God.
20 Thou knowest the commandments, Do not commit adultery, Do not kill, Do not steal, Do not bear false witness, Honour thy father and thy mother.
John 14
14 If ye shall ask any thing in my name, I will do it.
15 If ye love me, keep my commandments.
16 And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever;
John 14:21
He that hath my commandments, and keepeth them, he it is that loveth me: and he that loveth me shall be loved of my Father, and I will love him, and will manifest myself to him.
John 15:10
If ye keep my commandments, ye shall abide in my love; even as I have kept my Father's commandments, and abide in his love.
Acts 1:2
Until the day in which he was taken up, after that he through the Holy Ghost had given commandments unto the apostles whom he had chosen:
John 1:2
3 And hereby we do know that we know him, if we keep his commandments.
4 He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him.
Deuteronomy 8:6
Therefore thou shalt keep the commandments of the LORD thy God, to walk in his ways, and to fear him.
Isaiah 51:7
Hearken unto me, ye that know righteousness, the people in whose heart is my law; fear ye not the reproach of men, neither be ye afraid of their revilings.
[** Shows the connection between righteousness and the law.**]
Matthew 5:10
Blessed are they which are persecuted for righteousness' sake: for theirs is the kingdom of heaven.
Matthew 25
45 Then shall he answer them, saying, Verily I say unto you, Inasmuch as ye did it not to one of the least of these, ye did it not to me.
46 And these shall go away into everlasting punishment: but the righteous into life eternal.
1 John 3:10
In this the children of God are manifest, and the children of the devil: whosoever doeth not righteousness is not of God, neither he that loveth not his brother.
1 John 5
3 For this is the love of God, that we keep his commandments: and his commandments are not grievous.
John 7
49 But this people who knoweth not the law are cursed.
Acts 21
20 And when they heard it, they glorified the Lord, and said unto him, Thou seest, brother, how many thousands of Jews there are which believe; and they are all zealous of the law:
Acts 21 (James talking to Paul)
24 Them take, and purify thyself with them, and be at charges with them, that they may shave their heads: and all may know that those things, whereof they were informed concerning thee, are nothing; but that thou thyself also walkest orderly, and keepest the law.
[**This nearly 30 years after the crucifixtion**]
Deuteronomy 12
32 What thing soever I command you, observe to do it: thou shalt not add thereto, nor diminish from it.
Proverbs 12
28 In the way of righteousness is life: and in the pathway thereof there is no death.
Ecclesiastes 12
13 Let us hear the conclusion of the whole matter: Fear God, and keep his commandments: for this is the whole duty of man.
14 For God shall bring every work into judgment, with every secret thing, whether it be good, or whether it be evil.
These are just a small gathering of verses pertaining to keeping the law/commandments. Obviously they are important and Yeshua himself reminds us of their importance in obtaining eternal life. Just as Yahweh has repeatedly pointed out Himself.
At the time, they were living in lawlessness, so yes, while Yeshua came to preach repentence, it would only be natural for him to also remind people of the law.