John Gill's Exposition of the Whole Bible
Psalms 87:7
As well the singers as the players on the instruments shall be there,.... In Zion, in the church; signifying that there should be great spiritual joy there when the above things should be accomplished; great joy in the churches, because of the conversion of Jews and Gentiles; and great joy in the persons themselves, born again, and brought to Zion; in allusion to the vocal and instrumental music used in the temple service; see Isaiah 35:10
all my springs are in thee; which are either the words of the psalmist, or rather of the souls born in Zion; who, in their spiritual songs, will thus express themselves concerning the church, in which are the word and ordinances, compared to fountains of living water, and are springs of spiritual peace and refreshment to converted persons; see Joel 3:18, where also the Spirit and his graces are communicated by the ministry of the word and ordinances in the church, which are signified by wells and rivers of living water, John 4:14 and particularly here stands Christ, the fountain of gardens, and well of living waters, for the supply and comfort of saints, and his blood a fountain opened for cleansing and purification, Song of Solomon 4:15, yea, here flows the river of God's love, the streams whereof make glad the city of God; and which, like the waters in Ezekiel's vision, come from under the threshold of the sanctuary,
Psalms 46:4 or the words may be considered as an address of the psalmist, or of the church, or of regenerate persons, unto Christ:
all my springs or fountains are in thee; the fulness of grace dwells in him, the springs of all joy, and peace, and comfort, are with him; the wells of salvation are in him, and both grace and glory are from him; he is the spring of all grace now, and the fountain of all happiness hereafter. Gussetius z has a very peculiar version of the whole text, which he renders thus
"all my fountains will be singing in thee, or of thee, as those that dance at the sound of the pipe:''
taking the allusion to be to the playing of fountains in gardens, and to the delightful sound the waters make; but the accents will not admit of such a sense.
z Comment. Ebr. p. 845.