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

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)

Hadith #69

سَعْدُ بْنُ عَبْدِ اَللَّهِ عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ عِيسَى عَنِ اَلْحُسَيْنِ بْنِ سَعِيدٍ عَنْ عُبَيْدِ اَللَّهِ بْنِ مُعَاوِيَةَ بْنِ شُرَيْحٍ عَنْ أَبِيهِ قَالَ سَمِعْتُ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ يَقُولُ:« إِذَا جَاءَ اَلرَّجُلُ مُبَادِراً وَ اَلْإِمَامُ رَاكِعٌ أَجْزَأَتْهُ تَكْبِيرَةٌ وَاحِدَةٌ لِدُخُولِهِ فِي اَلصَّلاَةِ وَ اَلرُّكُوعِ»

Sa’ad ibn Abdillah narrated from Ahmad ibn Muhammad ibn Isa, from al-Husayn ibn Said, from Ubaydullah ibn Muawiyah ibn Shurayh, from his father, who said: I heard Aba Abdillah , peace be upon him, say: “If a man comes quickly and the imam (of prayer) is in rukuh, then one takbir suffices for him both to enter the prayer and to join in the ruku.”

Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 3, p. 49