Sahih Muslim 2982
Sahih Muslim · Book 55: The Book of Zuhd and Softening of Hearts · The Virtue Of Treating Widows, The Poor And Orphans Kindly
Abu Huraira reported that Allah's Messenger (ﷺ) said:
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ بْنِ قَعْنَبٍ ، حَدَّثَنَا مَالِكٌ ، عَنْ ثَوْرِ بْنِ زَيْدٍ ، عَنْ أَبِي الْغَيْثِ ، عَنْ أَبِي هُرَيْرَةَ ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " السَّاعِي عَلَى الأَرْمَلَةِ وَالْمِسْكِينِ كَالْمُجَاهِدِ فِي سَبِيلِ اللَّهِ - وَأَحْسِبُهُ قَالَ - وَكَالْقَائِمِ لاَ يَفْتُرُ وَكَالصَّائِمِ لاَ يُفْطِرُ " .
One who makes efforts (for earning to be spent) on a widow and the destitute is like a striver in the cause of Allah, and I think he also said: He is like one who constantly stands for prayer and observes fast without breaking it.