This was why the Jews were (ezētoun | ἐζήτουν | imperf act ind 3 pl) seeking (ezētoun | ἐζήτουν | imperf act ind 3 pl) all the more to kill him, because he not only used to break the Sabbath, but he also was calling God his own Father, thus making himself equal with God.
Reference
John 5:18
Sequence
53