Ahmad ibn Muhammad from Al-Husayn ibn Sa'id from Fadalah from Al-Husayn ibn Uthman from Sama'ah from Abu Basir:
Abu Abdillah عليه السلام said: "Do not sit in the Iq'a' position between the two prostrations."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 325