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.

Ye shall not tempt the Lord - Ye shall not provoke him by entertaining doubts of his mercy, goodness, providence, and truth.
As ye tempted him in Massah - How did they tempt him in Massah? They said, Is the Lord among us or not? Exodus 17:1-7. After such proofs as they had of his presence and his kindness, this was exceedingly provoking. Doubting God's kindness where there are so many evidences of it, is highly insulting to God Almighty.

Ye shall not (g) tempt the LORD your God, as ye tempted [him] in Massah.
(g) By doubting his power, refusing lawful means, and abusing his graces.

Ye shall not tempt the Lord your God,.... By striving with him or against him, by murmuring at or complaining of his providential dealings with them, or by requiring a sign of him, or miracles to be done by him; this is another passage used by Christ to repel the temptations of Satan, Matthew 4:7,
as tempted him in Massah; a place so called from the Israelites tempting the Lord there, Exodus 17:7, the Targum of Jonathan adds, with ten temptations; see Numbers 14:21.

Ye shall not tempt - Not provoke him, as the following instance explains. Sinners, especially presumptuous sinners, are said to tempt God, that is, to make a trial of God, whether he be, so wise as to see their sins, so just and true and powerful as to take vengeance on them, concerning which they are very apt to doubt because of the present impunity and prosperity of many such persons.