Zaid bin Khalid (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said, "He who equips a Ghazi (fighter) in the way of Allah is as if he has taken part in the fighting himself; and he who looks after the dependants of a Ghazi in his absence, is as if he has taken part in the fighting himself."[Al-Bukhari and Muslim].
App reference: Book 12, Hadith 22
Arabic/English book reference: Book 12, Hadith 1306