1 Corinthians 1:16
Then, having abashed those who were unsound in this respect and subjoining, “I baptized also the house of Stephanas,” he again drags down their pride, saying besides, “I know not whether I baptized any other.” For by this he signifies that neither did he seek much to enjoy the honor accruing hereby from the multitude, nor did he set about this work for glory's sake.
Source: Homilies on First Corinthians (New Advent)