1 Corinthians 11:24

11:24 and after he had given thanks he broke it and said, “This is my body, which is for you. Do this in remembrance of me.”

1 Corinthians 15:3

15:3 For I passed on to you as of first importance ¹  what I also received – that Christ died for our sins according to the scriptures,

¹ tn Grk “among (the) first things.”