It was narrated from ibn ‘Umar (may Allāh be please with him) that he said, “Allāh’s Messenger (May Allāh praise him and Peace be upon him) visited a companion who was unwell while I was with him. So, he entered the place where the man was while the man was praying on a piece of wood. He put his forehead on the piece of wood. So, he motioned to him, so he threw the piece of wood and took a cushion. Then the Allāh’s Messenger (May Allāh praise him and Peace be upon him) said, “Leave it. If you can, prostrate on the ground; and if you cannot, then motion and make your prostration lower than your rukū’ (bowing).” [Al Silsilah Al Ṣaḥīḥah 323].