Musnad Ahmad 785:1

Ali ibn Bahr narrated to us, Isa ibn Yunus narrated to us, Ibn Jurayj informed us, from Ibrahim ibn Maysarah, from Amr ibn al-Sharid, from his father, al-Sharid ibn Suwayd, who said: "The Messenger of Allah (peace and blessings of Allah be upon him) passed by me while I was sitting like this, having placed my left hand behind my back and leaning upon the palm of my hand. He said: 'Do you sit in the sitting posture of those who have incurred [Allah's] wrath?'"