كتاب الإمارة
33  
The Book on Government
(38)
Chapter: The virtue of helping the warrior who is fighting in the cause of Allah with mounts etc., and looking after his family in his absence
(38)
باب فَضْلِ إِعَانَةِ الْغَازِي فِي سَبِيلِ اللَّهِ بِمَرْكُوبٍ وَغَيْرِهِ وَخِلاَفَتِهِ فِي أَهْلِهِ بِخَيْرٍ
Sahih Muslim 1894

It has been narrated on the authority of Anas b. Malik that a young man from Aslam tribe said:

Messenger of Allah, I wish to fight (in the way of Allah) but I don't have anything to equip myself with for fighting. He (the Holy Prophet) said: Go to so and so, for he had equipped himself (for fighting) but he fell ill. So, he (the young man) went to him and said: The Messenger of Allah (ﷺ) sends you his greetings and says that you should give me the equipage that you have provided yourself with. The man said (to his wife or maidservant): So and so, give him the equipage I have collected for myself and do not withhold anything from him. Do not withhold anything from him so that you may be blessed therein.
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَفَّانُ، حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ، حَدَّثَنَا ثَابِتٌ، عَنْ أَنَسِ بْنِ مَالِكٍ، ح

وَحَدَّثَنِي أَبُو بَكْرِ بْنُ نَافِعٍ، - وَاللَّفْظُ لَهُ - حَدَّثَنَا بَهْزٌ، حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ، حَدَّثَنَا ثَابِتٌ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ فَتًى، مِنْ أَسْلَمَ قَالَ يَا رَسُولَ اللَّهِ إِنِّي أُرِيدُ الْغَزْوَ وَلَيْسَ مَعِي مَا أَتَجَهَّزُ قَالَ ‏ "‏ ائْتِ فُلاَنًا فَإِنَّهُ قَدْ كَانَ تَجَهَّزَ فَمَرِضَ ‏"‏ ‏.‏ فَأَتَاهُ فَقَالَ إِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم يُقْرِئُكَ السَّلاَمَ وَيَقُولُ أَعْطِنِي الَّذِي تَجَهَّزْتَ بِهِ قَالَ يَا فُلاَنَةُ أَعْطِيهِ الَّذِي تَجَهَّزْتُ بِهِ وَلاَ تَحْبِسِي عَنْهُ شَيْئًا فَوَاللَّهِ لاَ تَحْبِسِي مِنْهُ شَيْئًا فَيُبَارَكَ لَكِ فِيهِ ‏.‏

Reference : Sahih Muslim 1894
In-book reference : Book 33, Hadith 197
USC-MSA web (English) reference : Book 20, Hadith 4667
  (deprecated numbering scheme)