1 Corinthians 6:16; 1 Corinthians 10:8; 1 Corinthians 16:2

16 What? know ye not that he which is joined to an harlot is one body? for two, saith he , shall be one flesh.
8 Neither let us commit fornication , as some of them committed , and fell in one day three and twenty thousand.
2 Upon the first day of the week let every one of you lay by him in store , as God hath prospered him , that there be no gatherings when I come .