Ibn Juraij said: "And 'Amr bin Dinar added: 'He (Ziyad) said: "'Amir informed me from his father that he saw the Prophet (ﷺ) supplicating like that. And the Prophet (ﷺ) would brace himself with his left hand on his left knee.
In-book : Book 2, Hadith 600
English translation : Book 3, Hadith 984