Musafi' al-Hajabi narrates from his father, from his grandfather (Sayyiduna Uthman bin Talhah (may Allah be pleased with him)), that he saw the Messenger of Allah (peace and blessings be upon him) praying two rak'ahs behind the middle pillar of the Ka'bah; and in the House (of Allah), or he said: in the Ka'bah, there were three pillars.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8365