Musa ibn 'Ali reported that the Prophet ﷺ said, "Shall I show you the greatest sadaqa (or one of the greatest forms of sadaqa)?" He replied, "Yes, indeed, Messenger of Allah!" He went on, "To provide for your daughter when she is returned to you and you are her sole source of provision."

أَنَّ النَّبِيَّ ﷺ قَالَ لِسُرَاقَةَ بْنِ جُعْشُمٍ أَلاَ أَدُلُّكَ عَلَى أَعْظَمِ الصَّدَقَةِ أَوْ مِنْ أَعْظَمِ الصَّدَقَةِ؟ قَالَ بَلَى يَا رَسُولَ اللهِ قَالَ ابْنَتُكَ مَرْدُودَةٌ إِلَيْكَ لَيْسَ لَهَا كَاسِبٌ غَيْرُكَ

Suraqa ibn Ju'shum reported that the Messenger of Allah ﷺ said the like of previous hadith.

أَنَّ رَسُولَ اللهِ ﷺ قَالَ يَا سُرَاقَةُ مِثْلَهُ

Al-Miqdam ibn Ma'dikarib heard the Messenger of Allah ﷺ say, "What you feed yourself is sadaqa for you. What you feed your child is sadaqa for you. What you feed your wife is sadaqa is for you. What you feed your servant is sadaqa for you."

أَنَّهُ سَمِعَ رَسُولَ اللهِ ﷺ يَقُولُ مَا أَطْعَمْتَ نَفْسَكَ فَهُوَ لَكَ صَدَقَةٌ وَمَا أَطْعَمْتَ وَلَدَكَ فَهُوَ لَكَ صَدَقَةٌ وَمَا أَطْعَمْتَ زَوْجَكَ فَهُوَ لَكَ صَدَقَةٌ وَمَا أَطْعَمْتَ خَادِمَكَ فَهُوَ لَكَ صَدَقَةٌ