Amatul Rahmân Omer:
When you are free to set out to take the spoils (of the war of Khaibar), those who (contrived to be) left behind (from joining you at Hudaibiyah) will say, `Permit us to follow you.´ They would like to change the word of Allâh (and His decree). Say, `You shall not follow us. This is what Allâh has declared beforehand.´ They will thereupon say, `(There is no such foreword,) you are infact jealous of us.´ (What they say is in fact wrong.) Little do they understand (that this is the punishment for their not being present at Hudaibiyah).