Targum zu Bamidbar 10:36

But when the ark should rest, the Cloud gathered itself to ether and stood, but did not overspread, until Mosheh, standing in prayer, prayed and besought mercy from before the Lord, thus speaking: Return now, Thou Word of the Lord, in the goodness of Thy mercy, and lead Thy people Israel, and let the glory of Thy Shekinah dwell among them, and (Thy) mercy with the myriads of the house of Jakob, and with the multitudes of the thousands of Israel.

But when the ark rested, Mosheh lifted his hands in prayer, and said, O Word of the Lord, turn from the strength of Thy anger, and return unto us in the goodness of Thy mercy, and bless the myriads and multiply the thousands of the children of Israel.