1 Corinthians 1:15-17

so that no one would say that you were baptized into my name. Now I also baptized the household of Stephanas; beyond that, I do not know if I baptized anyone else. For Christ did not send me [as an apostle] to baptize, but [commissioned and empowered me] to preach the good news [of salvation]—not with clever and eloquent speech [as an orator], so that the cross of Christ would not be made ineffective [deprived of its saving power].