3 Divine omniscience. The Lord knows everyone completely. The thought is continuous in the two lines of this verse; it uses anthropomorphic language to stress God’s exacting knowledge. But as Plaut, 169, says, this verse is not intended as a statement of theology but an incentive for conduct. Of course, for the righteous divine omniscience is a great comfort (see also 2 Ch 16:9; Ps 11:4; Heb 4:13, which show that God’s purpose in this activity is salvific).
Expositor’s Bible Commentary
15:3 eyes of the Lord. Cf. 5:21. This refers to God’s omniscience. Cf. 1 Sam 16:7; 2Ch 16:9; Job 24:23; Pss 33:13–15; 139:1–16; Jer 17:10.
MacArthur Study Bible
15:3 The eyes of the Lord is a major theme in Proverbs: the Lord knows the actions and hearts of all, so he is neither pleased with nor fooled by one who offers sacrifices while continuing in the way of wickedness (cf. vv. 8–9, 11, 26, 29).
ESV Study Bible
15:3 keep watch over the evil and the good Yahweh sees the ways of all people (Prov 5:21). The Psalms portray Him as examining humanity from His heavenly throne (Psa 11:4–5). He watches so He can eventually bring all actions under His judgment (Eccl 12:14).
Faithlife Study Bible
15:3 eyes of the Lord. See 2 Chr. 16:9; Ps. 33:13–15. The sages sometimes looked beyond the observable events and natural retribution to remind themselves of the reality of divine justice. See theological note “God Sees and Knows: Divine Omniscience.”
Reformation Study Bible