Musnad Ahmad 788:233

Sulayman ibn Dawud narrated to us, he said: Imran informed us, from Qatadah, from Abu Burdah, from Abu Musa, that the Prophet, may Allah bless him and grant him peace, whenever he feared a man or a people, would say: "O Allah, I place You in their throats, and I seek refuge in You from their evils."