"Say to the ones who remained behind among the Bedouins: 'You will be called to a people of great military might'"—and al-ba's (might) is fighting.
"'You will fight them or they will submit'"—meaning: you will fight them for [the sake of] Islam.
Al-Hasan and Mujahid said: They are the people of Persia. "'So if you obey, Allah will give you a good reward; but if you turn away as you turned away before'"—Al-Kalbi said: [Meaning] on the day of Hudaybiyyah.
