Charles Ellicott Commentary Psalms 121:8

"Jehovah will keep thy going out and thy coming in From this time forth and for evermore." — Psalms 121:8 (ASV)

Thy going out and thy coming in. — A common Hebrew expression to denote the whole of life (See Deuteronomy 28:6 and following; compare St. Paul’s prayer, 1 Thessalonians 5:23).