Commentaries:
Barnes' Notes
But let all those that put their trust in thee rejoice - Compare the notes at Psalms 2:12. That is, they have occasion to rejoice in thee and in thy protection. The wicked have everything to dread, for they must be cut off; but the righteous have every reason to be happy, for they shall partake of the favor of God. This is, at the same time, the earnest expression of a desire that they might rejoice, and that the dealings of God with them might be such that they would ever "have occasion" for joy.
Let them even shout for joy - Internal joy or happiness is often expressed by shouting, or singing, as the word used here frequently signifies. The meaning is, that they should give every proper expression to their feeling of joy. This may be done by singing, or by grateful ascriptions of praise and gratitude.
Because thou defendest them - While the wicked are cut off Psalms 5:10. The psalmist, in this expression, doubtless had a primary reference to himself and to those who adhered to him in his righteous cause; but, as is common in the Psalms, he gives to the sentiment a general form, that it might be useful to all who fear and love God.
Let them also that love thy name - That love thee - the name being often put for the person. This is but another form of designating the righteous, for it is one of their characteristics that they love the name of God.
Be joyful in thee - Rejoice in thee - in thine existence, thy perfections, thy government, thy law, thy dealings, thy service; in all that thou hast revealed of thyself, and in all that thou doest. Compare Philippians 3:1, note; Philippians 4:4, note. It is one of the characteristics of the truly pious that they do find their happiness in God. They rejoice that there is a God, and that he is just such a being as he is; and they take delight in contemplating his perfections, in the evidences of his favor and friendship, in communion with him, in doing his will.
: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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