Riyad as-Salihin: The Book of Jihad – Hadith No. 627 — Zaid bin Khalid (May Allah be pleased with him) reported: The Messenger of… (Hadith No. 627)

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.".

Explanation:

Reference: Riyad as-Salihin, The Book of Jihad, Hadith No. 627