Sahih Al Bukhari 1: Chapter 2, Hadith 56

(56) What is said regarding the statement: “The reward of deeds depends upon the intention and hoping to get rewards from Allah.”

حَدَّثَنَا الْحَكَمُ بْنُ نَافِعٍ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ أَخْبَرَنَا شُعَيْبٌ، ‏‏‏‏‏‏عَنِ الزُّهْرِيِّ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ حَدَّثَنِي عَامِرُ بْنُ سَعْدٍ، ‏‏‏‏‏‏عَنْ سَعْدِ بْنِ أَبِي وَقَّاصٍ أَنَّهُ أَخْبَرَهُ، ‏‏‏‏‏‏أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ "إِنَّكَ لَنْ تُنْفِقَ نَفَقَةً تَبْتَغِي بِهَا وَجْهَ اللَّهِ إِلَّا أُجِرْتَ عَلَيْهَا حَتَّى مَا تَجْعَلُ فِي فَمِ امْرَأَتِكَ".

SAHIH HADITH:

Narrated Sa'd bin Abi Waqqas: Allah's Apostle 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.

REFERENCE:

Sahih Al Bukhari 1: Chapter 2, Hadith 56