Paul was a spiritual father to the people who went to the Corinthian church and also many other Christians.
1 Corinthians 4:
14 I am not writing these things to shame you, but to warn you as my beloved children. 15 For even if you had ten thousand others to teach you about Christ, you have only one spiritual father. For I became your father in Christ Jesus when I preached the Good News to you. 16 So I urge you to imitate me.
17 That’s why I have sent Timothy, my beloved and faithful child in the Lord. He will remind you of how I follow Christ Jesus, just as I teach in all the churches wherever I go.
18 Some of you have become arrogant, thinking I will not visit you again. 19 But I will come—and soon—if the Lord lets me, and then I’ll find out whether these arrogant people just give pretentious speeches or whether they really have God’s power. 20 For the Kingdom of God is not just a lot of talk; it is living by God’s power.