The Victory - 48:16
"Say to the remnant of the Arabs, "You will be called upon against a powerful people. You will fight them until they surrender. If you obey, Allah will give you a good reward. If you turn away, as you turned away before, He will punish you with a painful torment."
A new test for those who stayed back from the war and then repented and asked for repentance:
The Repentance/9:117
Allah has accepted the repentance of the Messenger and those who emigrated and those who helped. They followed him at a time of difficulty when some of them almost lost heart. Then He accepted their turning (repentance). He is Most Compassionate towards them, Most Merciful.
The Repentance/9:118
(He accepted the repentance) of those three who remained behind. The earth had become narrow for them despite its vastness. They were overwhelmed. At last they realized that they could not escape Allah. So He turned to them to turn to Him. Allah is the All-Approving, All-Merciful.
The Victory/48:16
"Say to the remnant of the Arabs, "You will be called upon against a powerful people. You will fight them until they surrender. If you obey, Allah will give you a good reward. If you turn away, as you turned away before, He will punish you with a painful torment."