Umar · The Book of Jihad and Expeditions

The properties abandoned by Banu Nadir were the ones which Allah bestowed upon His Apostle for which no expedition was undertaken either with cavalry or camelry. These properties were particularly meant for the Prophet (ﷺ). He would meet the annual expenditure of his family from the income thereof, and would spend what remained for purchasing horses and weapons as preparation for Jihad.

When it was the day on which the Battle of Badr was fought, the Messenger of Allah (ﷺ) cast a glance at the infidels, and they were one thousand while his own Companions were three hundred and nineteen. The Prophet (ﷺ) turned (his face) towards the Qibla. Then he stretched his hands and began his supplication to his Lord: "O Allah, accomplish for me what Thou hast promised to me. O Allah, bring about what Thou hast promised to me.…

I will expel the Jews and Christians from the Arabian Peninsula and will not leave any but Muslim.