Al-Kāfi

Hadith 804
imam-kazimahl-al-baytwilayah
-أَحْمَدُ بْنُ مِهْرَانَ عَنْ مُحَمَّدِ بْنِ عَلِيٍّ عَنْ عَبْدِ الله الْقَلاءِ عَنِ الْمُفَضَّلِ بْنِ عُمَرَ قَالَ ذَكَرَ أَبُو عَبْدِ الله (عَلَيْهِ السَّلام) أَبَا الْحَسَنِ (عَلَيْهِ السَّلام) وَهُوَ يَوْمَئِذٍ غُلامٌ فَقَالَ هَذَا الْمَوْلُودُ الَّذِي لَمْ يُولَدْ فِينَا مَوْلُودٌ أَعْظَمُ بَرَكَةً عَلَى شِيعَتِنَا مِنْهُ ثُمَّ قَالَ لِي لا تَجْفُوا إِسْمَاعِيلَ.
8. Ahmad ibn Mihran has narrated from Muhammad ibn Ali from ‘Abdallah al-Qalla’ from al-Mufaddal ibn ‘Umar who has said the following. “Abu ‘Abdallah (a.s.) spoke of abu al-Hassan (a.s.) and he was a young boy in those days. He said, “This is a child that no other child born to us has been of such a greater blessing to our followers than him.” The Imam (a.s.) then said to me, “Do not be harsh with Isma‘il.”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī