Jamieson, Fausset and Brown on Job 38:7

7. So at the founding of Zerubbabel's temple (Ezr 3:10-13). So hereafter at the completion of the Church, the temple of the Holy Ghost (Zec 4:7); as at its foundation (Lu 2:13, 14).

morning stars--especially beautiful. The creation morn is appropriately associated with these, it being the commencement of this world's day. The stars are figuratively said to sing God's praises, as in Psa 19:1; 148:3. They are symbols of the angels, bearing the same relation to our earth, as angels do to us. Therefore they answer to "sons of God," or angels, in the parallel. See on Job 25:5.