Isaiah 44:21

In these verses we have, I. The duty which Jacob and Israel, now in captivity, were called to, that they might be qualified and prepared for the deliverance designed them. Our first care must be to get good by our afflictions, and then we may hope to get out of them. The duty is expressed in two words: Remember and return, as in the counsel to Ephesus, Rev 2:4, Rev 2:5. 1. "Remember these, O Jacob! Remember what thou hast been told of the folly of idolatry, and let the convictions thou art now under be ready to thee whenever thou art tempted to that sin. Remember that thou art my servant, and therefore must not serve other masters." 2. Return unto me, Isa 44:22. It is the great concern of those who have backslidden from God to hasten their return to him; and this is that which he calls them to when they are in affliction, and when he is returning to them in a way of mercy. II. The favours which Jacob and Israel, now in captivity, were assured of; and what is here promised to them upon their remembering and returning to God is in a spiritual sense promised to all that in like manner return to God. It is a very comfortable word, for more is implied in it than is expressed (Isa 44:21): "O Israel! thou shalt not be forgotten of me, though for the present thou seemest to be so.

— Matthew Henry's Concise Commentary (public domain)

Remember--"Be not like the idolaters who consider not in their heart" (Isa 44:19). these--things just said as to the folly of idol-worship. my servant--not like the idolaters, slaves to the stock of a tree (Isa 44:19). See Isa 44:1-2. thou . . . not . . . forgotten of me--Therefore thou oughtest to "remember" Me.

— Jamieson-Fausset-Brown Commentary (public domain)