Sunan Ibn Majah
2758
Daif+3

It was narrated that ‘Umar bin Khattab said:“I heard the Messenger of Allah (ﷺ) say: ‘Whoever equips a warrior in the cause of Allah until he is fully equipped, he will have a reward like his, until he dies or returns.”

DaifAl-Albani
DaifMuhammad Fouad Abd al-Baqi