At-Tawbah 9:83

Fa-in rajaAAaka Allahu ila ta-ifatinminhum fasta/thanooka lilkhurooji faqul lantakhrujoo maAAiya abadan walan tuqatiloo maAAiya AAaduwwaninnakum radeetum bilquAAoodi awwala marratin faqAAudoomaAAa alkhalifeen

If Allāh should return you to a faction of them [after the expedition] and then they ask your permission to go out [to battle], say, "You will not go out with me, ever, and you will never fight with me an enemy. Indeed, you were satisfied with sitting [at home] the first time, so sit [now] with those who stay behind."

Then, if Allah brings you back to a group of them and they seek your permission to march, say to them, “You shall never march with me ever after, and shall never fight an enemy in my company. You were happy with sitting back the first time; now, sit with those remaining behind”.