Jamieson, Fausset and Brown on Matthew 4:7

7. Jesus said unto him, It is written again--(De 6:16), as if he should say, "True, it is so written, and on that promise I implicitly rely; but in using it there is another Scripture which must not be forgotten."

Thou shalt not tempt the Lord thy God--"Preservation in danger is divinely pledged: shall I then create danger, either to put the promised security skeptically to the proof, or wantonly to demand a display of it? That were 'to tempt the Lord my God,' which, being expressly forbidden, would forfeit the right to expect preservation."