It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him), Usamah bin Zayd, Uthman bin Talhah and Bilal entered the Ka'bah. He (peace and blessings be upon him) stayed in the House for a long time, then came out. Abdullah (bin Umar) entered right after them, the first of the people, and asked Bilal (may Allah be pleased with him): Where did the Messenger of Allah (peace and blessings be upon him) pray? He said: "Between the two pillars."
Hadith Referenceالمعجم الكبير للطبراني / باب الباء / 1042