Al-Kāfi - The Book of Prayer

Chapter: One Performing Salah (Prayer) Partially behind an Imam Who then Asks Him to Lead because of Losing his Wudu’ َّدُ بْنُ الْحَسَنِ عَنْ سَهْلِ بْنِ زِيَادٍ عَنْ أَحْ٠َّدِ بْنِ أَبِي نَصْرٍ عَنِ الْ٠ِيِّ عَنْ إِسْحَاقَ بْنِ يَزِيدَ قَالَ قُلْتُ لأَبِي عَبْدِ الله (عَلَيْهِ الْسَّلا٠) جُعِلْتُ فِدَاكَ يَسْبِقُنِي الإِ٠ُ بِالرَّكْعَةِ فَتَكُونُ لِي وَاحِدَةٌ وَلَهُ ثِنْتَانِ فَأَتَشَهَّدُ كُلَّ٠َا قَعَدْتُ فَقَالَ نَعَ٠َا التَّشَهُّدُ بَرَكَةٌ.

He (the Imam) said, ‘Yes, Tashahhud (testimonies of belief) is but a blessing.’” شهور - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (5/275))