"Must perish except"

1. Alma 34: 9
     9 For it is expedient that an atonement should be made; for according to the great plan of the Eternal God there must be an atonement made, or else all mankind must unavoidably perish; yea, all are hardened; yea, all are fallen and are lost, and must perish except it be through the atonement which it is expedient should be made.
2. Moro. 9: 22
     22 But behold, my son, I recommend thee unto God, and I trust in Christ that thou wilt be saved; and I pray unto God that he will spare thy life, to witness the return of his people unto him, or their utter destruction; for I know that they must perish except they repent and return unto him.