Chapter on the Rulings of Congregational Prayer (the Minimum Number for Congregational Prayer, the Description of the Imam, Who Is to Be Followed and Who Is Not to Be Followed, Recitation Behind Both of Them, the Rulings of Those Led in Prayer, and Other Such Rulings Related to It)

Tahdhīb al-Aḥkām|Volume 3|Book 1|Chapter 3

Chapter on the Rulings of Congregational Prayer (the Minimum Number for Congregational Prayer, the Description of the Imam, Who Is to Be Followed and Who Is Not to Be Followed, Recitation Behind Both of Them, the Rulings of Those Led in Prayer, and Other Such Rulings Related to It)

سَعْدُ بْنُ عَبْدِ اَللَّهِ عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ سَهْلٍ اَلْأَشْعَرِيِّ عَنْ أَبِيهِ عَنْ أَبِي اَلْحَسَنِ اَلرِّضَا عَلَيْهِ اَلسَّلاَمُ قَالَ: سَأَلْتُهُ عَمَّنْ رَكَعَ مَعَ إِمَامٍ يَقْتَدِي بِهِ ثُمَّ رَفَعَ رَأْسَهُ قَبْلَ اَلْإِمَامِ قَالَ« يُعِيدُ رُكُوعَهُ مَعَهُ»

Sa’ad ibn Abdillah from Ahmad ibn Muhammad from Muhammad ibn Sahl al-Ashari from his father from Abu al-Hasan al-Ridha , peace be upon him, who said: I asked Imam al-Ridha about someone who performed rukuh with an imam (of prayer) whom he follows, then raised his head before the imam. Imam said: “He should repeat his rukuh along with him.”

Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 3, p. 52
Shaykh Baqir al-Behbudi
Ṣaḥīḥ al-Tahdhīb

Chapter on the Rulings of Congregational Prayer (the Minimum Number for Congregational Prayer, the Description of the Imam, Who Is to Be Followed and Who Is Not to Be Followed, Recitation Behind Both of Them, the Rulings of Those Led in Prayer, and Other Such Rulings Related to It)

Volume 3, Book 1, Chapter 3

Chapter on the Rulings of Congregational Prayer (the Minimum Number for Congregational Prayer, the Description of the Imam, Who Is to Be Followed and Who Is Not to Be Followed, Recitation Behind Both of Them, the Rulings of Those Led in Prayer, and Other Such Rulings Related to It)

Hadith #75