NET
18 For this reason the Jewish leaders were trying even harder to kill him, because not only was he breaking the Sabbath, but he was also calling God his own Father, thus making himself equal with God.
Darby
18 For this therefore the Jews sought the more to kill him, because he had not only violated the sabbath, but also said that God was his own Father, making himself equal with God.
KJV
18 Therefore the Jews sought the more to kill him, because he not only had broken the sabbath, but said also that God was his Father, making himself equal with God.