John Calvin on Deuteronomy 6:16-19

16. Ye shall not tempt the Lord. Since the doctrine here should undoubtedly be referred to the First Commandment, we gather from it that this is the main foundation of piety, to give to Him what is His own, and to diminish nothing from the prerogative which He claims. As we have already seen, unbelief was the fountain and cause of the tempting in Massah, for when the people neither relied on God’s providence nor rested on His paternal love, they burst forth into impatience, and at length advanced so far as to think that God was not with them, unless He complied with their wicked lusts. We perceive, then, that God cannot be rightly worshipped unless when He has His peculiar attributes acknowledged. Whence, also, it appears that true piety cannot be dissevered from faith, because, if we confess that every desirable good dwells in Him, we shall expect and seek for all things from Him; we shall also patiently and contentedly allow ourselves to be governed by His will, and, in a word, give up ourselves and our lives into His hands.

Leviticus 19

Leviticus 19:1, 2

1. And the Lord spake unto Moses, saying,

1. Loquutus est Jehova ad Mosen, dicendo:

2. Speak unto all the congregation of the children of Israel, and say unto them, Ye shall be holy: for I the Lord your God am holy.

2. Loquere ad universum coetum filiorum Israel, et dic eis, Sancti estote, quia ego sanctus Jehova Deus vester.