Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) said: I asked Bilal (may Allah be pleased with him) where the Messenger of Allah (peace and blessings be upon him) prayed, meaning in the House (the Ka'bah). He said: "Between the two front pillars; he prayed two rak'ahs."
Hadith Referenceالمعجم الكبير للطبراني / باب الباء / 1034