Deuteronomy 6:16

Sons of Israel, my people, be warned not to tempt the Lord your God as you tempted Him in the ten temptations;

in Massah the name of a place , as in “He called the name of the place Massah…” [Exodus 17: 7]. There I explained the meaning of the name [comment on Exodus 17: 2]. People were questioning whether “God is among us” [Exodus 17: 7]: If so, we will worship him. But there is no need to put God to the test. Simply keep his commandments; and if you do what is right in His sight, He will grant you every good, and

YE SHALL NOT TRY THE ETERNAL YOUR G-D, meaning AS YE TRIED HIM IN MASSAH. You are not to say “If the Eternal is among us to perform miracles on our behalf or, if we succeed when we worship Him and we have plenty of food, and are well, then we will observe His Torah.” For that was the intent of the people there [in Massah] that they would see that if G-d would provide water for them through a miracle from Himself, they would follow Him in the wilderness, and if not, they would forsake Him. This was considered a great sin on their part, for, after it had been confirmed to them with signs and wonders that Moses was a prophet of G-d and that the word of the Eternal in his mouth was truth, it was no longer proper to do anything as a test. Whoever does it, is not testing [the credibility of] the prophet, it is only G-d blessed be He, whom he is testing to determine whether the Eternal’s hand waxed short. He prohibited for all generations to test the Torah or the prophets because it is not proper to worship G-d by being skeptical or by requesting a wonder or some test, since it is not G-d’s will to perform miracles for all men at all times. Nor is it fitting to serve Him in order to receive a reward. Instead, should one find suffering and misfortune [as a result of] serving Him and walking in the ways of the Torah, it is proper that he accept everything as a just judgment and he should not say, as the wicked ones of our people said, And what profit is it that we have kept His charge, and that we have walked mournfully, because of the Eternal of hosts? Scripture states here Ye shall diligently keep the commandments of the Eternal your G-d, and His testimonies, [alluding] that these are the miracles which He did for you of old in order that they be a testimony for you, such as the Passover, the Unleavened Bread, and the Booth. And you should keep His statutes even though you do not know their purpose for, in truth, He will benefit you in the end. There is no need for verification of the Torah and the commandments since it has been confirmed to you that it is from Him, blessed be He. Similarly, if any prophet has [previously] been tested and confirmed as a true prophet with signs and wonders in accordance with the law of the Torah, 7:7. you must not challenge his words regarding any reward or punishment he tells you about, and have no doubt about His power, exalted be He, [to bring it about]. Rather, you are to believe in His Torah and believe in His prophets and you will prosper. Thus he has assured us that ultimately the honor will surely come through possession of the Land and triumph over the enemies, for this was the great beneficence that was necessary for that generation. Thereafter he said that for future generations there was no need for testing [the reward for] the observance of the commandments; instead, they are to inquire of their fathers and their elders and they [the fathers and elders] will tell them of the veracity of the Torah and the commandments, as he will explain [in the verse], When thy son asketh thee — up to the conclusion of the section.