시편 15:2 해설: Rashi & Radak

and speaks truth in his heart The good that he says in his heart is true. He is not a hypocrite [lit. one in mouth and one in heart].

He that walketh perfectly: – If תמים (perfect) is an adjective, his meaning is, One who walks in a perfect way, as, “He that walketh in a perfect way, he shall minister unto me” (ibid. 101:6); while if it is a noun, (it is used) as (in the passage) “if in truth and perfectness (בתמים)” (Judges 9:16). He means: He who walks in perfectness (integrity), as, “But as for me I will walk in mine integrity (בתמי)” (Ps. 26:11). But in either case the meaning is the same. The perfect is he who occupies himself in the affairs of this world in the way of perfectness (integrity), who does not engage his deepest purpose in (the prosecution of) worldly schemes.

and worketh righteousness: – because he does all his works in righteousness. Now the laws of man, positive and negative, fall under three aspects: one concerned with deed, one with speech, and one with thought. Notice he has just mentioned (that concerned with) deed.