It was with reference to some great and surprising deliverance of the people of God out of bondage and distress that this psalm was penned, most likely their return out of Babylon in Ezra's time. Though Babylon be not mentioned here (as it is, Psa 137:1-9) yet their captivity there was the most remarkable captivity both in itself and as their return out of it was typical of our redemption by Christ. Probably this psalm was penned by Ezra, or some of the prophets that came up with the first. We read of singers of the children of Asaph, that famous psalmist, who returned then, Ezr 2:41. It being a song of ascents, in which the same things are twice repeated with advancement (Psa 126:2, Psa 126:3, and Psa 126:4, Psa 126:5), it is put here among the rest of the psalms that bear that title. I. Those that had returned out of captivity are here called upon to be thankful (Psa 126:1-3). II. Those that were yet remaining in captivity are here prayed for (Psa 126:4) and encouraged (Psa 126:5, Psa 126:6). It will be easy, in singing this psalm, to apply it either to any particular deliverance wrought for the church or our own land or to the great work of our salvation by Christ. A song of degrees.