Musnad Ahmad 456:28

Isma'il ibn Ibrahim narrated to us, he said: 'Ali ibn al-Mubarak al-Huna'i—a trustworthy Basran—narrated to us, from Yahya ibn Abi Kathir, from Abu Salamah, from Busr ibn Sa'id, from Zayd ibn Khalid al-Juhani, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever equips a warrior, he has indeed fought, and whoever looks after his family in his absence, he has indeed fought."