Jami at-Tirmidhi — Chapters on the description of the Day of Judgement, Ar-Riqaq, and Al-Wara' — Hadith No: 2432
Translation
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).'" [Abü 'Eisa said:] This Hadith is Gharib [as a narration of AlMughirah bin Shu'bah] we do not know of it except through the narration of 'Abdur-Rahmãn bin Ishaq [and there is something on this topic from Abu Hurairah]