Sahih Muslim Book - 32, Hadith - 4575

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ وَمُحَمَّدُ بْنُ عَبَّادٍ وَأَبُو بَكْرِ بْنُ أَبِى شَيْبَةَ وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ - وَاللَّفْظُ لاِبْنِ أَبِى شَيْبَةَ - قَالَ إِسْحَاقُ أَخْبَرَنَا وَقَالَ الآخَرُونَ حَدَّثَنَا سُفْيَانُ عَنْ عَمْرٍو عَنِ الزُّهْرِىِّ عَنْ مَالِكِ بْنِ أَوْسٍ عَنْ عُمَرَ قَالَ كَانَتْ أَمْوَالُ بَنِى النَّضِيرِ مِمَّا أَفَاءَ اللَّهُ عَلَى رَسُولِهِ مِمَّا لَمْ يُوجِفْ عَلَيْهِ الْمُسْلِمُونَ بِخَيْلٍ وَلاَ رِكَابٍ فَكَانَتْ لِلنَّبِىِّ -صلى الله عليه وسلم- خَاصَّةً فَكَانَ يُنْفِقُ عَلَى أَهْلِهِ نَفَقَةَ سَنَةٍ وَمَا بَقِىَ يَجْعَلُهُ فِى الْكُرَاعِ وَالسِّلاَحِ عُدَّةً فِى سَبِيلِ اللَّهِ.

It was narrated that 'Umar said: The wealth of Banu An-Nadir was among the Fai' that Allah granted to His Messenger (s.a.w), where the Muslims did not undertake any expedition with their cavalry or camelry. It was only for the Prophet (s.a.w), and he used to spend it on the annual expenditure of his family, and whatever was left he spent on animals (for fighting) and weapons, in preparation for (Jihad) for the sake of Allah.