Hadith #3989 (Sunan Abi Dawud)
Book: Dialects and Readings of the Qur'an (Kitab Al-Huruf Wa Al-Qira'at)
Narrator(s): al-Rabi' bin Anas al-Bakry الربيع بن أنس البكري, Ishaq bin Sulaiman al-Razi إسحاق بن سليمان الرازي, Muhammad bin Rafa'i محمد بن رافع
Grade: Sahih

The Prophet (ﷺ) as saying – the narrator Isma’il transmitted it from Abu Hurairah, and mentioned the tradition about the coming down of revelation-: “So far (is this the case) that when terror is removed from their hearts.”

Source: https://parallelquran.com/hadith/sunan-abi-dawud-3989/