Musannaf Ibn Abi Shaybah

Hazrat Ibn Abbas (may Allah be pleased with both of them) says that a sick person can prostrate on a pillow and a clean cloth.

Hazrat Umm Hasan narrates that she saw Hazrat Umm Salamah, due to an ailment of the eyes, a leather cushion was placed for her, upon which she would perform prostration.

It is narrated similarly through another chain.

The same hadith is narrated with different wording through another chain of transmission.

Hazrat Ibn Sirin narrates that Hazrat Anas performed prostration on a cushion.

Hazrat Abu Khulda narrates that Abu Al-Aaliyah was ill, a pillow would be rolled and placed for him, and he would prostrate on it.

Hazrat Qatadah says that Hasan did not consider it objectionable for a person to prostrate on a cushion in a boat.