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)

أَحْمَدُ بْنُ مُحَمَّدِ بْنِ عِيسَى عَنْ مُحَمَّدِ بْنِ يَحْيَى عَنْ طَلْحَةَ بْنِ زَيْدٍ عَنْ أَبِي جَعْفَرٍ عَنْ أَبِيهِ عَنْ عَلِيٍّ عَلَيْهِ اَلسَّلاَمُ قَالَ:« يَجْعَلُ اَلرَّجُلُ مَا أَدْرَكَ مَعَ اَلْإِمَامِ أَوَّلَ صَلاَتِهِ» قَالَ جَعْفَرٌ« وَ لَيْسَ نَقُولُ كَمَا يَقُولُ اَلْحَمْقَى»

Ahmad ibn Muhammad ibn Isa from Muhammad ibn Yahya from Talhah ibn Zayd from Abu Ja’far from his father , from Imam Ali , peace be upon him, who said: Imam Ali said: “A man counts what he has caught with the imam (of prayer) as the beginning of his prayer.” Imam Ja’far (al-Sadiq ) said: “And we do not say as the fools say.” (meaning the opponents)

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 #73