Al-Mughirah bin Shu'bah narrated that The Messenger of Allah (s.a.w) said:
"The sign of the believers upon the Sirat is: O lord, protect (us), protect (us).'" (ID)
English reference (ID): Vol. 4, Book 11, Hadith 2432 (ID)
Arabic reference (ID): Book 37, Hadith 2619 (ID)