Sahih Muslim Book - 27, Hadith - 4269

وَحَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ أَخْبَرَنَا جَرِيرٌ عَنْ سُلَيْمَانَ التَّيْمِىِّ عَنْ ضُرَيْبِ بْنِ نُقَيْرٍ الْقَيْسِىِّ عَنْ زَهْدَمٍ عَنْ أَبِى مُوسَى الأَشْعَرِىِّ قَالَ أَتَيْنَا رَسُولَ اللَّهِ -صلى الله عليه وسلم- نَسْتَحْمِلُهُ فَقَالَ « مَا عِنْدِى مَا أَحْمِلُكُمْ وَاللَّهِ مَا أَحْمِلُكُمْ ». ثُمَّ بَعَثَ إِلَيْنَا رَسُولُ اللَّهِ -صلى الله عليه وسلم- بِثَلاَثَةِ ذَوْدٍ بُقْعِ الذُّرَى فَقُلْنَا إِنَّا أَتَيْنَا رَسُولَ اللَّهِ -صلى الله عليه وسلم- نَسْتَحْمِلُهُ فَحَلَفَ أَنْ لاَ يَحْمِلَنَا فَأَتَيْنَاهُ فَأَخْبَرْنَاهُ فَقَالَ « إِنِّى لاَ أَحْلِفُ عَلَى يَمِينٍ أَرَى غَيْرَهَا خَيْرًا مِنْهَا إِلاَّ أَتَيْتُ الَّذِى هُوَ خَيْرٌ ».

It was narrated that Abu Musa Al-Asha'ri said: "We came to the Messenger of Allah (s.a.w) to ask him for mounts, and he said: 'I do not have anything to give to you as mounts, and by Allah I will not give you mounts.' Then the Messenger of Allah (s.a.w) sent to us three camels with white humps. We said: 'We came to the Messenger of Allah (s.a.w) and asked him for mounts, and he swore that he would not give us mounts.' So we went back to him and told him, and he said: 'I do not swear an oath, then see that something else is better than it, but I do that which is better.'"