Commentaries:
Barnes' Notes
For thou, Lord, wilt bless the righteous - It is one of the characteristics of God that, while he will punish the wicked, he will show favor to the righteous; while he brings deserved punishment upon the one, he will show his favor to the other.
With favor wilt thou compass him as with a shield - That is, as a shield is thrown round or before one in the day of battle to protect him, so wilt thou throw thy protection around the righteous. For a description of a "shield," see the notes at Ephesians 6:16. Compare the notes at Psalms 3:3. On these accounts, David felt that he might trust in God in the day of trouble and danger; and, on the same account, all who are righteous may put their trust in him now.
:Title
Upon Nehiloth - The title of Psalms 4:1-8 is, "upon Neginoth." As that refers to a musical instrument, so it is probable that this does, and that the idea here is that this psalm was intended particularly for the music-master that had special charge of this instrument, or who presided over those that played on it. Perhaps the idea is that this psalm was specially designed to be accompanied with this instrument. The word here, Nehiloth - ne chı̂ylôth , plural. ne chı̂ylâh , singular - is supposed by Gesenius, Lexicon, to denote a flute, or pipe, as being "perforated," from châlal , to bore." The word occurs only in this place. Very various opinions have been entertained of its meaning. See Hengstenberg, "Com." The Latin Vulgate and the Septuagint understand it as meaning "inheritance" - the same as nachălâh , and as being somehow designed to refer to the people of God "as" a heritage. Latin Vulgate: In finem pro ca, quae hereditatem consequitur, psalmus David. So the Septuagint - ̔̀ ͂ ́ huper tēs klēronomousēs . So Luther, Fur das Erbe . What was the precise idea affixed to this it is not very easy to determine. Luther explains it, "according to the title, this is the general idea of the psalm, that the author prays for the inheritance or heritage of God, desiring that the people of God may be faithful to him, and may always adhere to him." The true interpretation, however, is evidently to regard this as an instrument of music, and to consider the psalm as adapted to be sung with the instrument of music specified. Why it was adapted particularly to "that" instrument of music cannot now be determined. Horsley renders it "upon the flutes." Compare Ugolin. Thesau. Ant. Sac.; tom. xxxii. pp. 158-170.
A Psalm of David - See introduction to Psalms 3:1-8.
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