Musannaf Ibn Abi Shayba 3:2230

Waki’ narrated to us, he said: Sufyan narrated to us, from ‘Amr ibn Maymun ibn Mihran, from his father, that he was asked: "What is the limit for a sick person to pray while sitting?" He said: "Its limit is that if the world were presented to him, he would not stand for it."