1 Corinthians 10:8

10:8 And let us not be immoral, as some of them were, and twenty-three thousand died in a single day. ¹ 

1 Corinthians 15:3

15:3 For I passed on to you as of first importance ²  what I also received – that Christ died for our sins according to the scriptures,

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¹ sn This incident is recorded in Num 25:1-9.

² tn Grk “among (the) first things.”