1 Corinthians 15:29

“Else what shall they do which are baptized for the dead, etc.] The apostle here returns to his subject, and makes use of new arguments to prove the doctrine of the resurrection of the dead, and reasons for it from the baptism of some persons; but what is his sense, is not easy to be understood, or what rite and custom, or thing, or action he refers to; which must, be either Jewish baptism, or Christian baptism literally taken, or baptism in a figurative and metaphorical sense. Some think that he refers to some one or other of the divers baptisms of the Jews; (see <580910>Hebrews 9:10) and particularly to the purification of such who had touched a dead body, which was done both by the ashes…”

“Else--if there be no resurrection. what shall they do?--How wretched is their lot! they . . . which are baptized for the dead--third person; a class distinct from that in which the apostle places himself, "we" (Co1 15:30); first person. ALFORD thinks there is an allusion to a practice at Corinth of baptizing a living person in behalf of a friend who died unbaptized; thus Paul, without giving the least sanction to the practice, uses an ad hominem argument from it against its practicers, some of whom, though using it, denied the resurrection: "What account can they give of their practice; why are they at the trouble of it, if the dead rise not?" [So Jesus used an ad hominem argument, Mat…”

“Else what shall they do ... - The apostle here resumes the argument for the resurrection which was interrupted at 1 Corinthians 15:19. He goes on to state further consequences which must follow from the denial of this doctrine, and thence infers that the doctrine must be true. There is, perhaps, no passage of the New Testament in respect to which there has been a greater variety of interpretation than this; and the views of expositors now by no means harmonize in regard to its meaning. It is possible that Paul may here refer to some practice or custom which existed in his time respecting baptism, the knowledge of which is now lost. The various opinions which have been entertained in regard…”

“Who are baptized for the dead - Perhaps baptized in hope of blessings to be received after they are numbered with the dead. Or, "baptized in the room of the dead" - Of them that are just fallen in the cause of Christ: like soldiers who advance in the room of their companions that fell just before their face. 1 Corinthians 15:30”

“15:29 Some first-century Christians apparently practiced baptism-by-proxy for dead unbelievers whom they wished to be saved. Paul neither endorses nor condemns the practice; he simply uses it as evidence for belief in resurrection. There is no other reference to such a practice in early Christian literature.”

“what: Co1 15:16, Co1 15:32; Rom 6:3, Rom 6:4; Mat 20:22 1 Corinthians 15:30”