Musannaf Ibn Abi Shayba 3:4789

Waki’ narrated to us, he said: Isma’il bin Abi Khalid narrated to us, he said: I heard Abu Salamah bin ‘Abd al-Rahman narrating that the Prophet, may Allah bless him and grant him peace, fell ill, so he said: "Command Abu Bakr to lead the people in prayer." Then the Prophet, may Allah bless him and grant him peace, felt a lightness in himself, so he went out. When Abu Bakr saw him, he went to step back, but the Prophet, may Allah bless him and grant him peace, gestured to him: "Stay where you are." The Prophet, may Allah bless him and grant him peace, came until he sat beside Abu Bakr. Abu Bakr would follow the Prophet, may Allah bless him and grant him peace, in prayer, and the people would follow Abu Bakr.