Silsilat al-Ahadith al-Sahihah

Abu Salamah bin Abdur Rahman bin Awf heard from Sayyiduna Hassan bin Thabit Ansari (may Allah be pleased with him), who said to Sayyiduna Abu Hurairah (may Allah be pleased with him) while putting him under oath: "I ask you by Allah, did you hear the Messenger of Allah (peace and blessings be upon him) say: 'Hassan! Respond on behalf of the Messenger of Allah. O Allah! Support him with the Holy Spirit (Jibreel Amin).'?" Sayyiduna Abu Hurairah said: "Yes."