Volume 2, Book 26, Number 668:
Narrated Salim that his father said,
“Allah’s Apostle, Usama bin Zaid, Bilal, and ‘Uthman bin abu Talha entered the Ka’ba and then
closed its door. When they opened the door I was the first person to enter (the Ka’ba). I met Bilal and
asked him, “Did Allah’s Apostle offer a prayer inside (the Ka’ba)?” Bilal replied in the affirmative and
said, “(The Prophet offered the prayer) in between the two right pillars.”
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SAHIH BUKHARI VOLUME 2 > BOOK 26: PILGRIMMAGE (HAJJ)