Sahih Muslim 2982
Abu Huraira reported that Allah's Messenger (ﷺ) said:
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.
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 ‏"‏ ‏.‏