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netbible:
Many suggestions have been offered for the puzzling expression baptized for the dead. The most likely interpretation is that some Corinthians had undergone baptism to bear witness to the faith of fellow believers who had died without experiencing that rite themselves. Paul's reference to the practice here is neither a recommendation nor a condemnation. He simply uses it as evidence from the lives of the Corinthians themselves to bolster his larger argument, begun in 15:12, that resurrection from the dead is a present reality in Christ and a future reality for them. Whatever they may have proclaimed, the Corinthians' actions demonstrated that they had hope for a bodily resurrection.
Ik zou hier aan toe willen voegen dat het dopen zelf ook opstaan uit de dood is, in figuurlijke zin, en als je dan een beetje rommelt met de vertaling uit het grieks zou het misschien kunnen betekenen dat Paulus hier dus beweert dat als je je laat dopen, je al belijdt te geloven in de opstanding.