Joseph Benson's Commentary of the Old and New Testaments - Psalms 4:3
Psalms 4:3. Know that the Lord Hebrew, Jehovah, the supreme, the everlasting God, whose favour is an infinite blessing, and whose wrath is a boundless evil; hath set apart Hath chosen; to himself And taken under his peculiar care and protection; him that is godly The man that truly fears, loves, and serves him. It is generally supposed that David spoke here primarily of himself, and of his own designation to the throne; that he is meant by the godly man, whom God had set apart for... read more
Albert Barnes' Notes on the Whole Bible - Psalms 4:3
But know - This is addressed to those whom, in the previous verse, he had called the “sons of men;” that is, his foes. This is designed to show them that their opposition to him must be vain, since God had determined to set him apart for his own service, and would, therefore, hear his prayer for relief and protection.That the Lord hath set apart - That Yahweh had done this; that is, that he had designated him to accomplish a certain work, or that he regarded him as an instrument to perform it.... read more