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.