Sa’id reported Sa’d came to the Prophet (SWAS) and asked him Which sadaqah do you like most? He replied Water.  

أَنَّ سَعْدًا أَتَى النَّبِيَّ ﷺ فَقَالَ أَىُّ الصَّدَقَةِ أَعْجَبُ إِلَيْكَ قَالَ الْمَاءُ  

The above mentioned tradition has also been narrated by Sa’d bin ‘Ubadah from the Prophet ﷺ in the same manner.  

عَنِ النَّبِيِّ ﷺ نَحْوَهُ  

Sa'd asked: Messenger of Allah, Umm Sa'd has died; what form of sadaqah is best? He replied: Water (is best). He dug a well and said: It is for Umm Sa'd.  

أَنَّهُ قَالَ يَا رَسُولَ اللَّهِ إِنَّ أُمَّ سَعْدٍ مَاتَتْ فَأَىُّ الصَّدَقَةِ أَفْضَلُ قَالَ الْمَاءُ قَالَ فَحَفَرَ بِئْرًا وَقَالَ هَذِهِ لأُمِّ سَعْدٍ  

The Prophet ﷺ said: If any Muslim clothes a Muslim when he is naked, Allah will clothe him with some green garments of Paradise; if any Muslim feeds a Muslim when he is hungry, Allah will feed him with some of the fruits of Paradise; and if any Muslim gives a Muslim drink when he is thirsty, Allah will give him some of the pure wine which is sealed to drink.  

حَدَّثَنَا أَبُو خَالِدٍ الَّذِي كَانَ يَنْزِلُ فِي بَنِي دَالاَنَ عَنْ نُبَيْحٍ عَنْ أَبِي سَعِيدٍ عَنِ النَّبِيِّ ﷺ قَالَ أَيُّمَا مُسْلِمٍ كَسَا مُسْلِمًا ثَوْبًا عَلَى عُرْىٍ كَسَاهُ اللَّهُ مِنْ خُضْرِ الْجَنَّةِ وَأَيُّمَا مُسْلِمٍ أَطْعَمَ مُسْلِمًا عَلَى جُوعٍ أَطْعَمَهُ اللَّهُ مِنْ ثِمَارِ الْجَنَّةِ وَأَيُّمَا مُسْلِمٍ سَقَى مُسْلِمًا عَلَى ظَمَإٍ سَقَاهُ اللَّهُ مِنَ الرَّحِيقِ الْمَخْتُومِ