Without sin?

He who is without sin cast the first stone.

Joh 8:7  So when they continued asking him, he lifted up himself, and said unto them, He that is without sin among you, let him first cast a stone at her. 

Joh 8:8  And again he stooped down, and wrote on the ground. 

Joh 8:9  And they which heard it, being convicted by their own conscience, went out one by one, beginning at the eldest, even unto the last: and Jesus was left alone, and the woman standing in the midst. 

Joh 8:10  When Jesus had lifted up himself, and saw none but the woman, he said unto her, Woman, where are those thine accusers? hath no man condemned thee? 

Joh 8:11  She said, No man, Lord. And Jesus said unto her, Neither do I condemn thee: go, and sin no more.