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)

Commentary #55

وأذا سها المأموم عن الركوع حتى دخل الامام في الركعة الثانية فليركع وليلحق الامام وليس عليه شئ

And if the follower forgets to perform rukuh until the imam (of prayer) has entered into the second rak’ah, then let him perform rukuh and join the imam (of prayer), and nothing is required of him.