Isaiah 54:4

“Fear not, &c.] The fulfilment of these things; however unlikely and unpromising they might seem, yet God was able to perform them; and therefore way should not be given to a fearful, distrustful, and unbelieving heart: for thou shall not be ashamed; as men are, when disappointed of what they have been hoping for and expecting; but so it should not be with the church, she should not be ashamed of her hope, faith, and confidence; for there would be a performance of all that the Lord had spoken: nor should she be ashamed of her barrenness, which should cease; and of the fewness of her children or converts, which would be many; and of the straitness of the place of her tent or habitation, which…”

“(Isa 41:10, Isa 41:14). shame of thy youth--Israel's unfaithfulness as wife of Jehovah, almost from her earliest history. reproach of widowhood--Israel's punishment in her consequent dismissal from God and barrenness of spiritual children in Babylon and her present dispersion (Isa 54:1; Isa 49:21; Jer 3:24-25; Jer 31:19; Hos 2:2-5).”

“Fear not ... - (See Isaiah 41:10, note, Isaiah 41:14, note). Neither shalt thou be confounded - All these words mean substantially the same thing; and the design of the prophet is to affirm, in the strongest possible manner, that the church of God should be abundantly prospered and enlarged. The image of the female that was barren is kept up, and the idea is, that there should be no occasion of the shame which she felt who had no children. For thou shalt forget the shame of thy youth - In the abundant increase and glory of future times, the circumstances of shame which attended their early history shall be forgotten. The ‘youth’ of the Jewish people refers doubtless to the bondage of Egypt,…”

“Ashamed - For the barrenness and widowhood, which once was the matter of thy grief and shame. Forget - Thou shalt not be upbraided with thy former barrenness in thy youthful state. Isaiah 54:5”

“Fear not: Isa 41:10, Isa 41:14, Isa 45:16, Isa 45:17, Isa 61:7; Pe1 2:6 thou shalt forget: Jer 31:19; Eze 16:22, Eze 16:43, Eze 16:60-63; Hos 3:1-5 Isaiah 54:5”

“The encouraging promise is continued in Isa 54:4 : "Fear not, for thou wilt not be put to shame; and bid defiance to reproach, for thou wilt not blush: no, thou wilt forget the shame of thy youth, and wilt no more remember the reproach of thy widowhood." Now that redemption was before the door, Israel was not to fear any more, or to be overcome (as the niphal nikhlam implies) by a felling of the shame consequent upon her state of punishment, or so to behave herself as to leave no room for hope. For a state of things was about to commence, in which she would have no need to be ashamed (on bōsh and châphēr or hechpı̄r), but which, on the contrary (כּי, imo, as in Isa 10:7; Isa 55:9), would…”