And we are to do this with love. Jesus' encounter with the woman caught in adultery reveals the folly of a condemning, rather than a loving, spirit. But Jesus went to the Mount of Olives. And they were saying this, testing Him, in order that they might have grounds for accusing Him. But Jesus stooped down, and with His finger wrote on the ground.
Nobody really knows.
Some say He wrote the Ten Commandments. Others say He wrote the seventh commandment. He made no attempt to defend her actions before her pious, hypocritical accusers. They were not prepared to merely throw rocks at the adulteress. The Law said she was to be stoned to death, and they were prepared to do that.