1 Corinthians 14:8
8 For if the trumpet gave an uncertain sound, who would prepare himself for war?
1 Corinthians 15:1-4
1 Now I declare to you, brothers, the gospel which I preached to you, which also you received, in which you also stand, 2 by which also you are saved, if you hold firmly the word which I preached to you--unless you believed in vain. 3 For I delivered to you first of all that which I also received: that Christ died for our sins according to the Scriptures, 4 that he was buried, that he was raised on the third day according to the Scriptures,