New Defender's Study Bible Notes
3:1 many are they. The rebellion of Absalom drew many followers, so that David had to flee Jerusalem (II Samuel 15:12-14). This is the background of Psalm 3, but it also reflects the experiences of Christ, as well as those of many followers of Christ through the centuries.
3:2 Selah. This word, indicating a pause for reflection, occurs seventy-one times in the book of Psalms, first of all here in Psalm 3:2 (also in Psalm 3:4,8). In effect it divides this psalm into three stanzas.
3:5 and slept. A person trusting fully in God can sleep under the most difficult of circumstances (Psalm 4:8; 127:2; Acts 12:6).
3:8 belongeth unto the LORD. Salvation is not the result of either human works or human choice, but is altogether of grace (Ephesians 2:8-10).
Psalm 4 (title) chief Musician. The “chief musician” was evidently someone appointed to lead in the singing of the psalms in worship services in the temple and in connection with the great festivals of Israel. This notation appears in the title of fifty-five of the psalms.
Psalm 4 (title) Neginoth. “Stringed instruments” is neginoth in Hebrews. This Hebrew word is left untranslated in many editions of the Bible. Six of the psalms (Psalms 4, 6, 54, 55, 67, 76) include this notation in their titles.