It is narrated from Sayyiduna Mughirah bin Shu'bah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The call of my Ummah on the Sirat (the bridge) will be: 'Sallim, sallim' (O Allah, save us, save us)."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 18149