Nahj al-Balāgha
Hadith 1841٢٦٤. وَقَالَ (عليه السلام): أَحْسِنُوا فِي عَقِبِ غَيْرِكُمْ تُحْفَظُوا فِي عَقِبِكُمْ.
264. Amīr al-mu’minīn, peace be upon him, said: Do good with the bereaved ones of others so that good is done to your bereaved ones also.