Sunan Abi Dawud Book 15, Hadith 33
Zaid bin Khalid al Juhani reported that Apostle of Allaah(ﷺ) as saying “He who equips a fighter in Allaah’s path has taken part in the fighting. And he looks after a fighter’s family when he is away has taken part in the fighting.”
Anas bin Malik reported on the authority of his father, The Apostle of Allaah(ﷺ) said “ You left behind some people in Madeenah who did not fail to be with you wherever you went and whatever you spent (of your goods) and whatever valley you crossed. They asked Apostle of Allaah(ﷺ) how can they be with us when they are still in Madeenah? He replied “They were declined by a valid excuse.”
Abu Sa’id Al Khudri said “The Apostle of Allaah(ﷺ) sent an expedition towards Banu Lihyan and said “One of the two persons should go forth. He then said to those who sat (at home), If any one of you looks after the family and property of a warrior, he will receive half the reward of the one who goes forth (in jihad).”