Abu Sa’id Al-Khudri reported: Indeed, some people from the Ansar asked the Messenger of Allah, peace be upon him, and he gave them. Then they asked (for charity) again and he gave them. Then they asked again and he gave them until all he had was gone. He said, “If I had anything, I would not withhold it. Whoever refrains from asking others, then Allah will make him content; and whoever would be self-sufficient, then Allah will make him self-sufficient; and whoever would be patient, then Allah will make him patient. There is no gift that is better and more comprehensive than patience.”
[Sahih Bukhari, Book 24, Number 548]
عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ رَضِيَ اللَّهُ عَنْهُ إِنَّ نَاسًا مِنْ الْأَنْصَارِ سَأَلُوا رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَأَعْطَاهُمْ ثُمَّ سَأَلُوهُ فَأَعْطَاهُمْ ثُمَّ سَأَلُوهُ فَأَعْطَاهُمْ حَتَّى نَفِدَ مَا عِنْدَهُ فَقَالَمَا يَكُونُ عِنْدِي مِنْ خَيْرٍ فَلَنْ أَدَّخِرَهُ عَنْكُمْ وَمَنْ يَسْتَعْفِفْ يُعِفَّهُ اللَّهُ وَمَنْ يَسْتَغْنِ يُغْنِهِ اللَّهُ وَمَنْ يَتَصَبَّرْ يُصَبِّرْهُ اللَّهُ وَمَا أُعْطِيَ أَحَدٌ عَطَاءً خَيْرًا وَأَوْسَعَ مِنْ الصَّبْرِ
صحيح البخاري كِتَاب الزَّكَاة بَاب الِاسْتِعْفَافِ عَنْ الْمَسْأَلَةِ