Book 24, Hadith 291

Some one came to Ibn Umar in his house and said:The Messenger of Allah has entered the Kabah." So Ibn Umar said, I (Ibn Umar) came and found that the Messenger of Allah had come out, and I found Bilal standing at the door. I said: "O Bilal, did the Messenger of Allah pray inside the Kabah?' He said: "Ues." I said: "Where>" He said: "Between these two columns, two Rakahs. Then he came out and prayed two Rakahs in front of the Kabah