So, the real question to ask is:Who at Corinth is practicing baptism for the dead. 1 Corinthian 15:29, and do they have Apostle Paul’s approval for this ritual?
Mormons teach that because Paul mentions baptism for the dead it should be an endorsement for this sacred ordinance.
Notice: this “sacred ordinance” does not take place inside a temple located in Corinth. It appears these baptisms are taking place in a somewhat public venue.
1 Corinthians 15:29 is difficult to understand, but when we compare it with the rest of Scripture we know that it does not mean a dead person can be saved by someone else being baptized on his or her behalf, because baptism is not a requirement for salvation in the first place.
According to the LDS: Through modern revelation the Lord told Joseph Smith in reference, to our ancestors