1 Corinthians 7:30; 1 Corinthians 11:2; 1 Corinthians 15:2

30 and those who weep, as though they did not weep; and those who rejoice, as though they did not rejoice; and those who buy, as though they did not possess;
2 Now I praise you because you remember me in everything and hold firmly to the traditions, just as I delivered them to you.
2 by which also you are saved, if you hold fast the word which I preached to you, unless you believed in vain.