7 So neither the one who plants nor the one who waters is anything, but only God, who makes things grow.

Read 1 Corinthians 3:7 Using Other Translations

So then neither is he that planteth any thing, neither he that watereth; but God that giveth the increase.
So neither he who plants nor he who waters is anything, but only God who gives the growth.
It’s not important who does the planting, or who does the watering. What’s important is that God makes the seed grow.