“I beseech you, brethren, (ye know the house of Stephanas, that it is the firstfruits of Achaia, and that they have addicted themselves to the ministry of the saints,)”
King James Version (KJV)
16:15 The first fruits of Achaia - The first converts in that province.
1Co 16:15 The house of Stephanas Paul had baptized the household of Stephanas. See PNT "1Co 1:16". The first fruits of Achaia. They were his first converts at Corinth.