Messenger of Allah ﷺ said, "You will be rewarded for whatever you spend for Allah's sake even if it were a morsel which you put in your wife's mouth."  

أَنَّهُ أَخْبَرَهُ أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِنَّكَ لَنْ تُنْفِقَ نَفَقَةً تَبْتَغِي بِهَا وَجْهَ اللَّهِ إِلَّا أُجِرْتَ عَلَيْهَا حَتَّى مَا تَجْعَلُ فِي فَمِ امْرَأَتِكَ  

Messenger of Allah ﷺ came to visit me during my ailment which had been aggravated during Hajjat-al- Wadaʿ. I said to him, "You see how sick I am. I have much property but have no heir except my only daughter May I give two thirds of my property in charity?"! He said, "No." I said, "Half of it?" He said, "No." I said "One third?" He said, "One third is too much, for to leave your heirs rich is better than to leave them poor, begging of others. Nothing you spend seeking Allah's pleasure but you shall get a reward for it, even for what you put in the mouth of your wife."  

جَاءَنَا رَسُولُ اللَّهِ ﷺ يَعُودُنِي مِنْ وَجَعٍ اشْتَدَّ بِي زَمَنَ حَجَّةِ الْوَدَاعِ فَقُلْتُ بَلَغَ بِي مَا تَرَى وَأَنَا ذُو مَالٍ وَلاَ يَرِثُنِي إِلاَّ ابْنَةٌ لِي أَفَأَتَصَدَّقُ بِثُلُثَىْ مَالِي قَالَ لاَ قُلْتُ بِالشَّطْرِ قَالَ لاَ قُلْتُ الثُّلُثُ قَالَ الثُّلُثُ كَثِيرٌ أَنْ تَدَعَ وَرَثَتَكَ أَغْنِيَاءَ خَيْرٌ مِنْ أَنْ تَذَرَهُمْ عَالَةً يَتَكَفَّفُونَ النَّاسَ وَلَنْ تُنْفِقَ نَفَقَةً تَبْتَغِي بِهَا وَجْهَ اللَّهِ إِلاَّ أُجِرْتَ عَلَيْهَا حَتَّى مَا تَجْعَلُ فِي فِي امْرَأَتِكَ  

"إِنَّكَ لَن تُنْفِقَ نَفقَة تَبْتَغِى بها وجهَ اللَّه إِلَّا أُجِرْتَ بِهَا حَتَّى مَا تَجْعَلُ فِى في امْرَأتِك".  

"أنْ تدعَ وَرَثَتَكَ أغْنِيَاءَ خيْرٌ مِنْ أنْ تَدَعَهُمْ عَالَة يتَكَفَّفُونَ النَّاسَ، وَلَنْ تُنْفِقْ نَفَقَةً تَبْتَغى بِهَا وَجْهَ اللَّهِ إِلا أُجرْتَ بهَا حَتَّى مَا تَجْعَلُ فِى امْرَأَتِك" .