عَنْ أَبِي مُوسَى رَضِيَ اللَّهُ عَنْهُ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ كَانَ إِذَا خَافَ مِنْ رَجُلٍ أَوْ مِنْ قَوْمٍ قَالَ اللَّهُمَّ إِنِّي أَجْعَلُكَ فِي نُحُورِهِمْ وَنَعُوذُ بِكَ مِنْ شُرُورِهِمْ
It is narrated from Sayyiduna Abu Musa (may Allah be pleased with him) that when the Noble Prophet (peace and blessings be upon him) feared any man or nation, he would recite this supplication: "O Allah! Indeed, I place You before them, and we seek refuge in You from their evils." (O Allah! Surely, I set You against them and we seek Your protection from their evils.)