قُلْتُ لِأَبِي عَبْدِ اللَّهِ ع إِنِّي مِنْ أَهْلِ بَيْتٍ قَدِ انْقَرَضُوا وَ لَيْسَ لِي وَلَدٌ قَالَ ادْعُ وَ أَنْتَ سَاجِدٌ- رَبِّ هَبْ لِي مِنْ لَدُنْكَ وَلِيًّا يَرِثُنِي رَبِّ هَبْ لِي مِنْ لَدُنْكَ ذُرِّيَّةً طَيِّبَةً إِنَّكَ سَمِيعُ الدُّعاءِ رَبِّ لا تَذَرْنِي فَرْداً وَ أَنْتَ خَيْرُ الْوارِثِينَ قَالَ فَفَعَلْتُ فَوُلِدَ لِي عَلِيٌّ وَ الْحُسَيْنُ.
“I once said to abu ‘Abd Allah (a.s.), that I belong to a family that is extinct and I do not have any children. He (the Imam) said, ‘Pray when you are in Sajdah (prostration), ‘[My Lord, grant me from Your dominion an heir who will inherit me]. O Lord, grant me fine offspring from Your dominion; You hear the prayers.