Hadith 2:6
Abu Huraira reported God’s messenger as saying, “When a man dies no further reward is recorded for his actions, with three exceptions:
sadaqa which continues to be supplied, or knowledge from which benefit continues to be reaped, or the prayers of a good son for his dead father.” Muslim transmitted it.
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: " إِذَا مَاتَ الْإِنْسَانُ انْقَطَعَ عَمَلُهُ إِلَّا مِنْ ثَلَاثَةِ أَشْيَاءَ: صَدَقَةٍ جَارِيَةٍ أوعلم ينْتَفع بِهِ أوولد صَالح يَدْعُو لَهُ) رَوَاهُ مُسلم
Original Reference: Mishkat al-Masabih 203