General Behavior (Kitab Al-Adab)
43/12. Chapter:
Regarding gratitude for acts of kindness
Sunan Abi Dawud
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا حَمَّادٌ، عَنْ ثَابِتٍ، عَنْ أَنَسٍ، أَنَّ الْمُهَاجِرِينَ، قَالُوا يَا رَسُولَ اللَّهِ ذَهَبَتِ الأَنْصَارُ بِالأَجْرِ كُلِّهِ . قَالَ " لاَ مَا دَعَوْتُمُ اللَّهَ لَهُمْ وَأَثْنَيْتُمْ عَلَيْهِمْ " .
Narrated Anas ibn Malik: The Immigrants (Muhajirun) said: Messenger of Allah! the Helpers (Ansar) got the entire reward. He said: no, so long as you pray to Allah for them and praise them.
Reference : Sunan Abi Dawud 4812In-book reference : Book 43, Hadith 40English translation : Book 42, Hadith 4794