John Gill Commentary Ezekiel 20:19

"I am Jehovah your God: walk in my statutes, and keep mine ordinances, and do them;" — Ezekiel 20:19 (ASV)

I [am] the Lord your God
Not only that had made them and preserved them, but had chosen them above all people to be his people; who had made a covenant with them, and had distinguished them by his favours from all others: walk in my statutes, and keep my judgments, and do them ;
which he had given to their fathers, and they had neglected and despised; those contained in the decalogue, and in the whole book of Deuteronomy, and elsewhere.