Hadith on Virtue: Be fair, be merciful, and keep your promises

Anas ibn Malik reported: The Messenger of Allah, peace and blessings be upon him, said, “When you judge, then be just. When you make a covenant, then keep it. When your mercy is sought, then be merciful. Whoever does not do any of that, the curse of Allah, His angels, and all people will be upon him.

Source: al-Mu’jam al-Kabīr 725

Grade: Sahih li ghayrihi (authentic due to external evidence) according to Al-Albani

عَنْ أَنَسِ بْنِ مَالِكٍ قَالَ قَالَ رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ إِنْ حَكَمُوا عَدَلُوا وَإِنْ عَاهَدُوا وَفَّوْا وَإِنِ اسْتُرْحِمُوا رَحِمُوا فَمَنْ لَمْ يَفْعَلْ ذَلِكَ مِنْهُمْ فَعَلَيْهِمْ لَعْنَةُ اللهِ وَالْمَلَائِكَةِ وَالنَّاسِ أَجْمَعِينَ

725 المعجم الكبير للطبراني

2188  المحدث الألباني خلاصة حكم المحدث صحيح لغيره في صحيح الترغيب