Tafsir of Al-Ahzab 33:27

وأورثكم أرضهم وديارهم وأموالهم

And He caused you to inherit their lands, and their houses, and their riches, means, `He gave these things to you after you killed them.'

وأرضا لم تطووها

and a land which you had not trodden. It was said that this was Khyber, or that it was the lands of the Persians and Romans. Ibn Jarir said, "It could be that all of these are referred to

وكان الله على كل شيء قديرا

And Allah is able to do all things.''