Sahih Muslim
The Book on Government (Kitab Al-Imara)
Book Number: 020 / Hadith Number: 4668
It has been narrated on the authority of Zaid b. Kbalid al-Juhani that the Messenger of Allah (may peace be upon him) said: Anybody who equips a warrior (going to fight) in the way of Allah (is like one who actually) fights. And anybody who looks well after his family in his absence (is also like one who actually) fights.