Musannaf Ibn Abi Shaybah

The Prophet (peace and blessings be upon him) forbade covering the face during prayer.

Muhammad considered covering the face during prayer to be disliked.

Ibrahim considered covering the face during prayer to be disliked.

Hazrat Ja'dah bin Hubairah saw a man who was performing prayer, and on his head was a helmet and a turban with which he had covered his face. He removed the helmet and turban from behind him.

Hazrat Hajjaj states that I asked Hazrat Ata about covering the face during prayer and tawaf. He declared it disliked in prayer and permitted it in tawaf.

Hazrat Abdur Rahman bin Mujbir narrates that whenever Hazrat Salim bin Abdullah saw a person covering his face during prayer, he would pull the cloth so forcefully that it would be removed from his face.

Hazrat Ata considered covering the face during prayer to be disliked (makruh).

Hazrat Ibn Abi Laila also says the same.

Hazrat Azhar, quoting Hazrat Ibn Aun, states that Hazrat Muslim bin Badeel considered it undesirable to pray in this manner. Saying this, he placed his cloth over his lips.

Ibrahim and Hazrat Sha'bi considered covering the face during prayer to be disliked.