Kehillah in Corinth I 5:5-7

Orthodox Jewish Bible

⁵ You are to transmit and hand over to Hasatan such a person for the churban of the basar (3:16-17), that his neshamah may be spared in the Yom Hashem (AMOS 5:18; MALACHI 3:19; YOEL 2:1-17; TZEFANYAH 1:14-18).

⁶ Your boasting is not good. Do you not have da’as that a little chametz all the mixture leavens?

⁷ Purge out the old chametz (leavened bread), that you may be issa chadasha (new dough, batzek, deaf dough, having no indication of fermentation), as you are indeed like matzot (unleavened bread). More than that, our Korban Pesach has been sacrificed, Moshiach. [SHEMOT 12:3-6,21]