When the Prophet ﷺ feared a (group of) people, he would say: "O Allah, we make Thee our shield against them, and take refuge in Thee from their evils." (Using translation from Abū Dāʾūd 1537)  

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا خَافَ قَوْمًا قَالَ «اللهُمَّ إِنَّا نَجْعَلُكَ فِي نُحُورِهِمْ وَنَعُوذُ بِكَ مِنْ شُرُورِهِمْ»  

[Machine] "I heard the Messenger of Allah ﷺ on the day of the trench saying, 'O Allah, the Revealer of the Book, swift in taking account, disperser of clouds, defeat them and shake them.'"  

سَمِعْتُ رَسُولَ اللهِ ﷺ يَوْمَ الْخَنْدَقِ يَقُولُ «اللهُمَّ مُنْزِلَ الْكِتَابِ سَرِيعَ الْحِسَابِ مُجْرِيَ السَّحَابِ اهْزِمْهُمْ وَزَلْزِلْهُمْ»  

[Machine] The last words of Prophet Ibrahim ﷺ when he was thrown into the fire were "HasbunAllah wa ni'mal wakil" (Allah is sufficient for us, and He is the best disposer of affairs). Your Prophet ﷺ said an example similar to it when the people said to them, "Indeed, the people have gathered against you, so fear them." But it [merely] increased them in faith and they said, "Sufficient for us is Allah, and [He is] the best Disposer of affairs." (Quran 3:173)  

كَانَ آخِرَ كَلَامِ إِبْرَاهِيمَ عَلَيْهِ الصَّلَاةُ وَالسَّلَامُ حِينَ أُلْقِيَ فِي النَّارِ «حَسْبِيَ اللهُ وَنِعْمَ الْوَكِيلُ» قَالَ وَقَالَ نَبِيُّكُمْ ﷺ مَثَلَهَا {الَّذِينَ قَالَ لَهُمُ النَّاسُ إِنَّ النَّاسَ قَدْ جَمَعُوا لَكُمْ فَاخْشَوْهُمْ فَزَادَهُمْ إِيمَانًا وَقَالُوا حَسْبُنَا} [آل عمران 173] اللهُ وَنِعْمَ الْوَكِيلُ