“I saw a man asking my father about a man who goes out to fight and buys and sells and trades during his campaign. My father said to him: ‘We were with the Messenger of Allah ﷺ in Tabuk, and we bought and sold, and he saw us and did not forbid us (to do that).’”  

عَنِ الرَّجُلِ يَغْزُو فَيَشْتَرِي وَيَبِيعُ وَيَتَّجِرُ فِي غَزْوِهِ فَقَالَ لَهُ أَبِي كُنَّا مَعَ رَسُولِ اللَّهِ ﷺ بِتَبُوكَ نَشْتَرِي وَنَبِيعُ وَهُوَ يَرَانَا وَلاَ يَنْهَانَا