Sahih al-Bukhari 5356
Sahih al-Bukhari · Book 69: Supporting the Family · It is obligatory to spend for one's wife and household.
Narrated Abu Huraira:
حَدَّثَنَا سَعِيدُ بْنُ عُفَيْرٍ ، قَالَ حَدَّثَنِي اللَّيْثُ ، قَالَ حَدَّثَنِي عَبْدُ الرَّحْمَنِ بْنُ خَالِدِ بْنِ مُسَافِرٍ ، عَنِ ابْنِ شِهَابٍ ، عَنِ ابْنِ الْمُسَيَّبِ ، عَنْ أَبِي هُرَيْرَةَ ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " خَيْرُ الصَّدَقَةِ مَا كَانَ عَنْ ظَهْرِ غِنًى، وَابْدَأْ بِمَنْ تَعُولُ " .
Allah's Messenger (ﷺ) said, "The best alms is that which you give when you are rich, and you should start first to support your dependants."