Simak al-Hanafi (may Allah have mercy on him) said: I heard Ibn Umar (may Allah be pleased with them both) say: The Messenger of Allah (peace and blessings be upon him) prayed inside the Ka'bah; soon a man will come and forbid you from that, so do not obey him. He meant Sayyiduna Ibn Abbas (may Allah be pleased with them both).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3788