Rashi, on Ps 16:4

“That my mouth may not speak the works of men: for the sake of the words of thy lips, I have kept hard ways.”

“As for man’s deeds, because of the word of Your lips, etc. To support my feet, etc. From then on, for every deed of man that I came to perform, I watched myself because of the word of Your lips; [I watched] the ways of the profligate, to turn away from them, so that I should not walk in them, but [would] support my feet constantly in Your paths, that my feet should not falter from them. Another explanation: For the deeds of man according to the word of Your lips, etc. Since a person must use his deeds according to the uprightness (decree - early editions) of the word of Your lips, as You said, “You shall not commit adultery,” I kept myself from the ways of the profligate although I behaved unseemly according to the good You have done.”

Imported from an open dataset — not yet checked against the printed edition.