I said to my friend: Let us first see his mode of living. He had a cap with two ears stuck (to his head), and wearing a brown silken robe. He was resting on a staff during prayer. We asked him (about resting on the staff) after salutation; He said: Umm Qays daughter of Mihsan said to me that when the Messenger of Allah (ﷺ) became aged and the flesh grew increasingly on him, he took a prop at his place of prayer and rested on it.
In-book : Book 2, Hadith 559
English translation : Book 3, Hadith 948