Jami` at-Tirmidhi 2487
Anas said:
"When the Messenger of Allah (s.a.w) arrived in Al-Madinah the Muhajirun came to him and said: 'O Messenger of Allah! We have not seen a people more willing to sacrifice when having a lot, nor more patient when having a little than the people whom we are staying among. Our provisions are so sufficient, and we share with them in their produce such that we fear that all our reward is gone. So the Prophet (s.a.w)  said: "No. As long as you supplicate to Allah for them and praise (show gratitude to) them(for it)."
حَدَّثَنَا الْحُسَيْنُ بْنُ الْحَسَنِ الْمَرْوَزِيُّ، بِمَكَّةَ حَدَّثَنَا ابْنُ أَبِي عَدِيٍّ، حَدَّثَنَا حُمَيْدٌ، عَنْ أَنَسٍ، قَالَ لَمَّا قَدِمَ النَّبِيُّ صلى الله عليه وسلم الْمَدِينَةَ أَتَاهُ الْمُهَاجِرُونَ فَقَالُوا يَا رَسُولَ اللَّهِ مَا رَأَيْنَا قَوْمًا أَبْذَلَ مِنْ كَثِيرٍ وَلاَ أَحْسَنَ مُوَاسَاةً مِنْ قَلِيلٍ مِنْ قَوْمٍ نَزَلْنَا بَيْنَ أَظْهُرِهِمْ لَقَدْ كَفَوْنَا الْمُؤْنَةَ وَأَشْرَكُونَا فِي الْمَهْنَإِ حَتَّى خِفْنَا أَنْ يَذْهَبُوا بِالأَجْرِ كُلِّهِ ‏.‏ فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏
"‏ لاَ مَا دَعَوْتُمُ اللَّهَ لَهُمْ وَأَثْنَيْتُمْ عَلَيْهِمْ ‏"‏ ‏.‏ قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ صَحِيحٌ حَسَنٌ غَرِيبٌ مِنْ هَذَا الْوَجْهِ ‏.‏