Jamieson, Fausset and Brown on 1 Corinthians 15:49

49. as--Greek, "even as" (see Ge 5:3).

we shall also bear--or wear as a garment [Bengel]. The oldest manuscripts and versions read, "We must also bear," or "let us also bear." It implies the divine appointment (compare "must," 1Co 15:53) and faith assenting to it. An exhortation, and yet implying a promise (so Ro 8:29). The conformity to the image of the heavenly Representative man is to be begun here in our souls, in part, and shall be perfected at the resurrection in both bodies and souls.