Al-Kāfi

Hadith 1332
prayer-etiquette
1ـ عَلِيُّ بْنُ إِبْرَاهِيمَ بْنِ هَاشِمٍ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ جَمِيلٍ وَمُحَمَّدُ بْنُ إِسْمَاعِيلَ عَنِ الْفَضْلِ بْنِ شَاذَانَ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ جَمِيلِ بْنِ دَرَّاجٍ عَنْ زُرَارَةَ قَالَ سَأَلْتُ أَبَا جَعْفَرٍ (عَلَيْهِ الْسَّلام) عَنِ الرَّجُلِ يَنْسَى تَكْبِيرَةَ الافْتِتَاحِ قَالَ يُعِيدُ.
1. Ali ibn Ibrahim ibn Hashim has narrated from his father from Ibn Abi ‘Umayr from Jamil and Muhammad ibn ’Isma‘il from al-Fadl ibn Shadhan from Ibn Abi ‘Umayr from Jamil ibn Darraj from Zurarah who has said the following: “I once asked abu Ja‘far (a.s.), about one who forgets the opening Takbir (Allah is great beyond description). He (the Imam) said, ‘He says it again.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī