Adam Clarke on Psalms 106:47

Save us, O Lord - and gather us - These words, says Calmet, are found in the hymn that was sung at the ceremony of bringing the ark to Jerusalem, 1 Chronicles 16; but it is supposed they were added by Ezra or some other prophet: here they are in their natural place. The author of the Psalm begs the Lord to gather the Israelites who were dispersed through different countries; for at the dedication of the second temple, under Nehemiah, (where it is probable this Psalm, with the 105th and the 107th, was sung), there were very few Jews who had as yet returned from their captivity.