It is an essential story of Jesus’ ministry. From John 8:

“3Then the scribes and Pharisees brought to Him a woman caught in adultery. And when they had set her in the midst,
4they said to Him, “Teacher, this woman was caught in adultery, in the very act.
5“Now Moses, in the law, commanded us that such should be stoned.d But what do You say?”
6This they said, testing Him, that they might have something of which to accuse Him. But Jesus stooped down and wrote on the ground with His finger, as though He did not hear.
7So when they continued asking Him, He raised Himself up and said to them, “He who is without sin among you, let him throw a stone at her first.”
8And again He stooped down and wrote on the ground.
9Then those who heard it, being convicted by their conscience, went out one by one, beginning with the oldest even to the last. And Jesus was left alone, and the woman standing in the midst.
10When Jesus had raised Himself up and saw no one but the woman, He said to her, “Woman, where are those accusers of yours? Has no one condemned you?”
11She said, “No one, Lord.” And Jesus said to her, “Neither do I condemn you; go and sin no more.”
12Then Jesus spoke to them again, saying, “I am the light of the world. He who follows Me shall not walk in darkness, but have the light of life.”
– NKJV