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 #50

وينبغي أن يكون بين الصفين قدر ما يتخطاه الانسان ولايجوز الجماعة ويكون بين الصفين حائل من حائط وغيره

And it is proper that there be between the two rows a space sufficient for a person to step over, and it is not permissible to hold congregation while there is a barrier such as a wall or the like between the two rows.