Musannaf Ibn Abi Shaybah 9071 — A man who prays with tablets

Amir (al-Sha'bi), Muhammad bin Ali, Ata, Tawus, al-Qasim and Mujahid said: If a man has tablets, written or unwritten, in his sleeve, or sheets on which poetry and the like is written, it is permissible for him to pray the obligatory prayer or any other prayer in that state.