Is the Hadith prohibiting the posture of those who have incurred Allah's wrath (leaning on the palm of the left hand) authentic, and is this sitting forbidden or merely disliked?

This Hadith (definition) is authentic and contains a prohibition against sitting while leaning on the left hand behind the back, whether in prayer or outside of it. The Prophet, peace and blessings be upon him, described this sitting posture as "the sitting of those who have incurred Allah's wrath" or "the sitting of those who are tormented." Scholars have differed regarding its ruling, oscillating between disapproval (makrooh) and prohibition (haram (definition)). However, describing it as the sitting of those who have incurred Allah's wrath strengthens the opinion of prohibition. For resting without falling into this prohibition, one may lean on the right hand alone or on both hands.