How Paul curses the man who committed fornication with his stepmother.

5 There is a report abroad that there is fornication among you, and such fornication as is not once named among the Gentiles: that a man should have his father’s wife. ² And you swell, and have not rather sorrowed, so that he who has done this deed might be put out from among you. ³ For indeed I, as absent in body yet present in spirit, have determined already (as though I were present) concerning him who has done this thing, ⁴ in the name of our Lord Jesus Christ, when you are gathered together, and my spirit, with the power of the Lord Jesus Christ, ⁵ to deliver him to Satan for the destruction of the flesh, so that the spirit may be saved in the day of the Lord Jesus.

⁶ Your complacency is not good. Do you not know that a little leaven sours the whole lump of dough? ⁷ Purge therefore the old leaven, so that you may be new dough, as you are sweet bread. For Christ our Passover lamb is offered up for us. ⁸ Therefore let us keep holy day – not with old leaven, neither with the leaven of immorality and wickedness, but with the sweet bread of pureness and truth.

⁹ I wrote to you in an epistle that you should not keep company with fornicators. ¹⁰ And I did not at all mean the fornicators of this world, or the covetous, or swindlers, or idolaters, because then you would need to go out of the world. ¹¹ But now I write to you not to keep company together with anyone called a brother who is a fornicator, or covetous, or a worshipper of images, or a railer, or a drunkard, or a swindler. With such a one, see that you do not eat. ¹² For what have I to do with judging those who are outside? Do you not judge those who are within? ¹³ Those who are without, God will judge. Put away from among you that evil person.