John Gill Commentary Leviticus 19:30

"Ye shall keep my sabbaths, and reverence my sanctuary; I am Jehovah." — Leviticus 19:30 (ASV)

You shall keep my sabbaths By attending to the worship and service of God on sabbath days, they and their children would be preserved from the idolatry of the Gentiles, and all the filthy practices attending it: and reverence my sanctuary ; and not defile it by such impurities as were committed in the temples of idols: the sanctuary being an holy place, sacred to him whose name is holy and reverend, and where was the seat of his glorious Majesty, and therefore not to be defiled by fornication or idolatry, or by doing anything in it unseemly and unbecoming, (See Gill on Mark 11:16): I [am] the Lord ; who had appointed the observance of the sabbath day, and dwelt in the sanctuary, and therefore expected that the one would be kept and the other reverenced, and neither of them polluted.