Christians must do what Jesus commanded (not Paul)

Luke 6

46 “Why do you call me ‘Lord, Lord,’ and not do what I tell you? 47 Every one who comes to me and hears my words and does them, I will show you what he is like: 48 he is like a man building a house, who dug deep, and laid the foundation upon rock; and when a flood arose, the stream broke against that house, and could not shake it, because it had been well built.[c] 49 But he who hears and does not do them is like a man who built a house on the ground without a foundation; against which the stream broke, and immediately it fell, and the ruin of that house was great.”

Luke 8

19 Then his mother and his brothers came to him, but they could not reach him for the crowd. 20 And he was told, “Your mother and your brothers are standing outside, desiring to see you.” 21 But he said to them, “My mother and my brothers are those who hear the word of God and do it.”

Three times in the Gospel of John, Jesus states that if you love Jesus, you will keep the commandments.

"If you love Me, keep My commandments." (John 14:15)

"He who has My commandments and keeps them, it is he who loves Me. And he who loves Me will be loved by My Father, and I will love him and manifest Myself to him." (John 14:21)