Tafsīr al-ʿAyyāshi: From Khālid bin al-Mukhtār who said:

I heard Jaʿfar bin Moḥammed عليه السلام say: What have they done? May Allāh destroy them! They proceeded to the greatest verse of the Book of Allāh, and thought that it would be an innovation (bidʿah) if they made it apparent (i.e. recited it loudly) – and it is In the name of Allāh, The Entirely Merciful, The Especially Merciful (Bismillah al-Raḥmān al-Raḥīm).

عن خالد بن المختار ، قال : سمعت جعفر بن محمد ( عليه السلام ) يقول : ما لهم – قاتلهم الله – عمدوا إلى أعظم آية في كتاب الله ، فزعموا أنها بدعة إذا أظهروها ، وهي ( بِسْمِ اللَّه الرَّحْمنِ الرَّحِيمِ )