Al-Adab Al-Mufrad, Hadith 138 ⓘ
Dawud said, "Be like a merciful father towards the orphan. Know that you will reap as you sow. How ugly poverty is after wealth! More than that: how ugly is misguidance after guidance! When you make a promise to your friend, fulfil your promise. If you do not, it will bring about enmity between you and him. Seek refuge in Allah from a companion who, when you mention something to him, does not help you and who does not remind you when you forget."
حَدَّثَنَا عَمْرُو بْنُ عَبَّاسٍ، قَالَ: حَدَّثَنَا عَبْدُ الرَّحْمَنِ، قَالَ: حَدَّثَنَا سُفْيَانُ، عَنْ أَبِي إِسْحَاقَ قَالَ: سَمِعْتُ عَبْدَ الرَّحْمَنِ بْنَ أَبْزَى قَالَ: قَالَ دَاوُدُ: كُنَّ لِلْيَتِيمِ كَالأَبِ الرَّحِيمِ، وَاعْلَمْ أَنَّكَ كَمَا تَزْرَعُ كَذَلِكَ تَحْصُدُ، مَا أَقْبَحَ الْفَقْرَ بَعْدَ الْغِنَى، وَأَكْثَرُ مِنْ ذَلِكَ، أَوْ أَقْبَحُ مِنْ ذَلِكَ، الضَّلاَلَةُ بَعْدَ الْهُدَى، وَإِذَا وَعَدْتَ صَاحِبَكَ فَأَنْجِزْ لَهُ مَا وَعَدْتَهُ، فَإِنْ لاَ تَفْعَلْ يُورِثُ بَيْنَكَ وَبَيْنَهُ عَدَاوَةٌ، وَتَعَوَّذْ بِاللَّهِ مِنْ صَاحِبٍ إِنْ ذَكَرْتَ لَمْ يُعِنْكَ، وَإِنْ نَسِيتَ لَمْ يُذَكِّرْكَ.
also referenced under: Book 7, Hadith 10 (In-Book) & Book 7, Hadith 138 (English)