1 Corinthians 3:6

I planted, Apollos watered; but God gave the increase. So then neither is he that planteth anything, neither he that watereth; but God that giveth the increase. Now he that planteth and he that watereth are one: but each shall receive his own reward, according to his own labor.

The location depicted here is fully identified later as "God's field" (1 Corinthians 3:9). The thought is that Paul planted the crop; Apollos cultivated and watered it. There is no reference to baptism in "watered."

Are one ... They were one in mutual love and respect for each other, one in purpose, one in status as God's servants, and one in their reliance upon the Lord who would reward both.

According to his own labor ... reveals that the gospel preacher's reward will be measured according to his work, and not according to his success. The injunction of God is not that men shall go and "convert" all nations, but that they shall "preach the gospel to the whole creation."