Ezekiel 20:11,12

I gave them my statutes— That is, says Bishop Warburton, he gave them the moral law of the decalogue, in which there was one positive institution, and no more; but this one absolutely necessary to preserve them a select people unmixed with the nations. By the word שׁבתותי shabbetotai, my sabbaths, says Houbigant, are understood those other solemnities, which, no less than the sabbaths strictly speaking, were a sign whereby God was known to be the God of Israel.