Psa 103:12, As far as the east is from the west, so far hath he removed our transgressions from us.
Psa 103:13, Like as a father pitieth his children, so the LORD pitieth them that fear him.
Psa 103:14, For he knoweth our frame; he remembereth that we are dust.
Psa 103:15, As for man, his days are as grass: as a flower of the field, so he flourisheth.
Psa 103:16, For the wind passeth over it, and it is gone; and the place thereof shall know it no more.
Psa 103:17, But the mercy of the LORD is from everlasting to everlasting upon them that fear him, and his righteousness unto children's children;
Psa 103:18, To such as keep his covenant, and to those that remember his commandments to do them.
Jesus Christ is the same yesterday, today, and for ever (Hebrews 13:8).
Jhn 15:12, This is my commandment, That ye love one another, as I have loved you.
Jhn 15:13, Greater love hath no man than this, that a man lay down his life for his friends.
Jhn 15:14, Ye are my friends, if ye do whatsoever I command you.
Jesus laid down His life for His friends. You are His friend, if you do what He commands.
What does He command; but that we love one another?
Rom 13:8, Owe no man any thing, but to love one another: for he that loveth another hath fulfilled the law.
Rom 13:9, For this, Thou shalt not commit adultery, Thou shalt not kill, Thou shalt not steal, Thou shalt not bear false witness, Thou shalt not covet; and if there be any other commandment, it is briefly comprehended in this saying, namely, Thou shalt love thy neighbour as thyself.
Rom 13:10, Love worketh no ill to his neighbour: therefore love is the fulfilling of the law.
We are to "love thy neighbor as thyself"; and this consists of obeying God's commandments:
1Jo 5:3, For this is the love of God, that we keep his commandments: and his commandments are not grievous.
2Jo 1:6, And this is love, that we walk after his commandments. This is the commandment, That, as ye have heard from the beginning, ye should walk in it.
The God of the Old Testament and the God of the New Testament are one and the same God. Jesus is the same YHWH. (Hebrews 13:8).
So, the commandments in the Old Covenant, as moral tenets which we are to follow, are still valid. They are the commandments of the LORD (Jesus).
Of course, commandments as concerning animal sacrifices are fulfilled in that Jesus died on the Cross as the fulfillment of those types. However, moral tenets are binding when it comes to what we read in the Old Testament. If we love our neighbor as ourselves, we will fulfill them; we will not violate them in our behaviour.
And I will say that the scriptures above do show that forgiveness is applied to those who, as a general rule, keep the commandments of the LORD.
It is not that we are saved through law-keeping.
It is that, if we are truly born again, we are inclined towards obedience.
There is a repentance that must take place in your heart in order to become a recipient of the Lord's forgiveness.
You must become Jesus' friend; and only then has He given His life for you.
You are His friend if you obey His commandments.
Jesus is the God of the Old and New Testaments.
If you love the Lord your God with all of your heart, soul, mind, and strength; and your neighbor as yourself: you will fulfill the righteousness of the law in your behaviour.
You will not be violating any law if you bear the fruit of the Spirit (Galatians 5:22-23).
The venue by which we obtain this righteousness is apart from the law; nevertheless this righteousness is attested to by the law and the prophets that it is righteousness indeed (Romans 3:21).
You must obtain the Holy Spirit through faith in Christ (Galatians 3:14); and then, as you walk not after the flesh but after the Spirit, the righteousness of the law will be fulfilled in you (Romans 8:4).
There is no law that will condemn your behaviour if you bear the fruit of the Spirit (Galatians 5:22-23).
So, you will not be disobedient to the commandments of the Lord if you are born again of the Holy Spirit. You will be a friend of Jesus according to the scriptures in question.