“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.”
King James Version (KJV)
5:18 His own Father - The Greek word means his own Father in such a sense as no creature can speak. Making himself equal with God - It is evident all the hearers so understood him, and that our Lord never contradicted, but confirmed it.
Joh 5:18 Because he not only had broken the Sabbath. The Pharisees were horrified, not only at what they deemed the breaking of the Sabbath, but at the high ground on which the Lord placed his defense. But said also that God was his Father. This high claim seemed to them blasphemous.