Reference: Saheeh at-Targheeb wat-Tarheeb #3066 – Shaykh al-Albaanee declared it authentic.
ash-Shareed ibn Suwayd (radhi-yAllaahu ‘anhu) reported:
The Messenger of Allaah ﷺ passed by me when I was sitting with my left hand behind my back and leaning on my palm. On seeing me in this posture he said:
«Do you sit like those upon whom the Wrath of Allaah has descended?»