From Sahih Muslim (Hadith 1172):
Hammam b. Munabbih reported:That is what Abu Huraira reported to us from the Messenger of Allah (ﷺ) and he narrated (some) ahadith one of which is that the Messenger of Allah (ﷺ) said: I have been helped by terror (in the hearts of enemies) and I have been given words which are concise but comprehensive in meaning
Reference: Muslim 1172