1 Corinthians 1:13; 1 Corinthians 1:23; 1 Corinthians 2:2; 1 Corinthians 2:8

13 Is Christ divided ? was Paul crucified for you? or were ye baptized in the name of Paul?
23 But we preach Christ crucified , unto the Jews a stumblingblock , and unto the Greeks foolishness;
2 For I determined not to know any thing among you, save Jesus Christ, and him crucified .
8 Which none of the princes of this world knew : for had they known it, they would not have crucified the Lord of glory.