Jesus did certain things which upset the Jewish religious leaders. They thought he showed disrespect for customs that the Jews had kept for many centuries. For example, Jews did no work at all on the 7th day of the week, the "Sabbath", because it was a holy day. In John's Gospel, chapter 5, there is the story of Jesus healing a crippled man. Jesus saw a man lying on a mattress. He healed the man, and told him to pick up the mattress and go home. Carrying the mattress on the Sabbath was against religious custom, so the religious leaders argued with Jesus about it. They then watched everything he did, and remembered all the things that were against the religious customs.