The Hebrew verb yasar means to discipline, chasten, instruct, or correct. It occurs approximately 43 times in the Old Testament and conveys the idea of training through correction — not punishment for its own sake, but formative discipline aimed at producing righteousness and wisdom in the one being corrected.
Yasar reveals that God's discipline is an expression of His love, not His wrath. Just as a father disciplines a beloved son, so the LORD disciplines those He loves (Proverbs 3:11-12; Deuteronomy 8:5). This verb is foundational to the wisdom tradition, where accepting discipline is the mark of wisdom and rejecting it is the mark of folly. The related noun musar (discipline, instruction) is one of the most important concepts in Proverbs, framing the entire book as training in the fear of the LORD.