Sahih Muslim 995
Sahih Muslim · Book 12: The Book of Zakat · The virtue of spending on one's family and slaves, and the sin of the one who neglects them or withholds maintenance from them
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ ، وَزُهَيْرُ بْنُ حَرْبٍ ، وَأَبُو كُرَيْبٍ - وَاللَّفْظُ لأَبِي كُرَيْبٍ - قَالُوا حَدَّثَنَا وَكِيعٌ ، عَنْ سُفْيَانَ ، عَنْ مُزَاحِمِ بْنِ زُفَرَ ، عَنْ مُجَاهِدٍ ، عَنْ أَبِي هُرَيْرَةَ ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " دِينَارٌ أَنْفَقْتَهُ فِي سَبِيلِ اللَّهِ وَدِينَارٌ أَنْفَقْتَهُ فِي رَقَبَةٍ وَدِينَارٌ تَصَدَّقْتَ بِهِ عَلَى مِسْكِينٍ وَدِينَارٌ أَنْفَقْتَهُ عَلَى أَهْلِكَ أَعْظَمُهَا أَجْرًا الَّذِي أَنْفَقْتَهُ عَلَى أَهْلِكَ " .
Of the dinar you spend as a contribution in Allah's path, or to set free a slave, or as a sadaqa given to a needy, or to support your family, the one yielding the greatest reward is that which you spent on your family.