Musnad Ahmad 1153:60

Ibn Abi ‘Adi narrated to us, from Dawud, from al-Sha’bi, from Masruq, who said: ‘Aisha said: I was the first of the people to ask the Messenger of Allah, may Allah bless him and grant him peace, about this verse: {On the day the earth is replaced by another earth, and the heavens, and they emerge before Allah, the One, the Prevailing}. She said: So I said: Where will the people be on that day, O Messenger of Allah? He said: "Upon the Bridge (al-Sirat)."