1 Corinthians 4:15
4:15 For though you may have ten thousand guardians in Christ, you do not have many fathers, because I became your father in Christ Jesus through the gospel.
1 Corinthians 10:8
10:8 And let us not be immoral, as some of them were, and twenty-three thousand died in a single day. 1
1 sn This incident is recorded in Num 25:1-9.