From Sahih Muslim (Hadith 6386):
Abd al-Rahman reported that he heard Hassin b. Thabit al-Ansari call Abu Huraira to bear witness by saying:I adjure you by Allah if you had not heard Allah's Apostle (ﷺ) saying: Hassin, give a reply on behalf of the Messenger of Allah. O Allah, help him with Ruh-ul-Qudus. Abu Huraira said: Yes, it is so
Reference: Muslim 6386