Radak

For the Lord knoweth the way of the righteous: – This verse is an explanation of the preceding; for he says in the congregation of righteous men without explaining in what sense the congregation of the righteous after death is (to be understood); therefore he interprets and says that (the Lord) knoweth; and the meaning of knoweth is “looks upon and considers with a view to doing them good.” And so (in the passage) “What is man that Thou takest knowledge of him?” (Ps. 144:3); “Whom the Lord knew” (Deut. 34:10); “for I know his sorrows” (Exod. 3:7); “Thou hast known my soul in adversities” (Ps. 31:8); “I did know thee” (Hos. 13:5). In this way too (we understand) “there is no man that will recognise me” (Ps. 142:5); “blessed be he that did recognise thee” (Ruth. 2:19). He says that God who is exalted gathers the souls of the righteous to Himself, and knows them, and recognises them to do them good and satisfy them with His goodness and knowledge and care; for this is the greatest good and the best recompense, as it is said: “and the soul of my Lord shall be bound in the bundle of life with the soul of the Lord thy God” (1 Sam, 25:29) But the way of the wicked shall perish: – for at their death they have no raising again, as he has said they shall not rise up; but their souls shall perish and go to perdition, as it is said (ibid.): “and the souls of thine enemies, them shall he sling out, as from the hollow of a sling.”