Musnad Ahmad 456:16

Ishaq ibn Yusuf narrated to us, 'Abd al-Malik informed us, from 'Ata', from Zayd ibn Khalid al-Juhani, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Do not make your houses graves; pray in them." "And whoever provides food for a fasting person, there is written for him the like of the reward of the fasting person, without the reward of the fasting person being diminished in the slightest." "And whoever equips a warrior in the way of Allah, or looks after his family in his absence, there is written for him the like of the reward of the warrior, without the reward of the warrior being diminished in the slightest."