1 Corinthians 1:23; 1 Corinthians 9:27; 1 Corinthians 15:11-12

23 But we preach Christ crucified , unto the Jews a stumblingblock , and unto the Greeks foolishness;
27 But I keep under my body, and bring it into subjection : lest that by any means , when I have preached to others, I myself should be a castaway.
11 Therefore whether it were I or they, so we preach , and so ye believed . 12 Now if Christ be preached that he rose from the dead, how say some among you that there is no resurrection of the dead?