"The hand of the traitor is not to be cut off." (Sahih) Abu 'Abdur-Rahman (An-Nasai) said: Ashath bin Sawwar (one of its narrators) is weak. (Using translation from Nasāʾī 4976)
أَبُو عَبْدِ الرَّحْمَنِ أَشْعَثُ بْنُ سَوَّارٍ ضَعِيفٌ لَا يُحْتَجُّ بِحَدِيثِهِ