Hadith 981
Abu Musa Al-Ashari (May Allah be pleased with him) reported:
عن أبي موسي الأشعري رضي الله عنه أن رسول الله كان إذا خاف قوماً قال: " اللهم إنا نجعلك في نحورهم ، ونعوذ بك من شرورهم" ((رواه أبو داود، والنسائي بإسناد صحيح)).
When the Messenger of Allah (ﷺ), feared mischief from a people, he would supplicate: "Allahumma inna naj'aluka fi nuhurihim, wa na'udhu bika min shururihim (O Allah! We ask You to face them, and seek Your Protection against their evil." [Abu Dawud and An- Nasa'i].
In plain words
When the Prophet feared harm from a group of people, he turned to Allah, asking Him to face them on his behalf and seeking His protection from their evil.
Reference : Riyad as-Salihin 981 In-book reference : Book 7, Hadith 26