It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) entered the Ka'bah, and with him (peace and blessings be upon him) were also Sayyiduna Usamah bin Zayd, Sayyiduna Bilal and Sayyiduna Uthman bin Talhah (may Allah be pleased with them). They 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 front pillars." And I forgot to ask how many rak'ahs he prayed.
Hadith Referenceالمعجم الكبير للطبراني / باب الباء / 1041