Charles Ellicott Commentary Psalms 147:2

"Jehovah doth build up Jerusalem; He gathereth together the outcasts of Israel." — Psalms 147:2 (ASV)

Build up— that is, of course, “rebuild.” The word “outcasts,” which is used in Isaiah 11:12; Isaiah 56:8, shows that the rebuilding after the captivity is intended. The Septuagint and Vulgate have “dispersion”; Symmachus, “those thrust out.”