Some people from the Ansar asked Messenger of Allah ﷺ (to give them something) and he gave to everyone of them, who asked him, until all that he had was finished. When everything was finished and he had spent all that was in his hand, he said to them, '"(Know) that if I have any wealth, I will not withhold it from you (to keep for somebody else); And (know) that he who refrains from begging others (or doing prohibited deeds), Allah will make him contented and not in need of others; and he who remains patient, Allah will bestow patience upon him, and he who is satisfied with what he has, Allah will make him self-sufficient. And there is no gift better and vast (you may be given) than patience."  

أَخْبَرَهُ أَنَّ أُنَاسًا مِنَ الأَنْصَارِ سَأَلُوا رَسُولَ اللَّهِ ﷺ فَلَمْ يَسْأَلْهُ أَحَدٌ مِنْهُمْ إِلاَّ أَعْطَاهُ حَتَّى نَفِدَ مَا عِنْدَهُ فَقَالَ لَهُمْ حِينَ نَفِدَ كُلُّ شَىْءٍ أَنْفَقَ بِيَدَيْهِ مَا يَكُنْ عِنْدِي مِنْ خَيْرٍ لاَ أَدَّخِرْهُ عَنْكُمْ وَإِنَّهُ مَنْ يَسْتَعِفَّ يُعِفُّهُ اللَّهُ وَمَنْ يَتَصَبَّرْ يُصَبِّرْهُ اللَّهُ وَمَنْ يَسْتَغْنِ يُغْنِهِ اللَّهُ وَلَنْ تُعْطَوْا عَطَاءً خَيْرًا وَأَوْسَعَ مِنَ الصَّبْرِ  

The Prophet ﷺ used to pray so much that his feet used to become edematous or swollen, and when he was asked as to why he prays so much, he would say, "Shall I not be a thankful slave (to Allah)?"  

سَمِعْتُ الْمُغِيرَةَ بْنَ شُعْبَةَ يَقُولُ كَانَ النَّبِيُّ ﷺ يُصَلِّي حَتَّى تَرِمَ أَوْ تَنْتَفِخَ قَدَمَاهُ فَيُقَالُ لَهُ فَيَقُولُ أَفَلاَ أَكُونُ عَبْدًا شَكُورًا