It is narrated from Sayyiduna al-Fadl bin Abbas (may Allah be pleased with him) that he entered the Ka'bah with the Prophet (peace and blessings be upon him) while Sayyiduna Bilal (may Allah be pleased with him) was at the door. Al-Fadl (may Allah be pleased with him) said: He (peace and blessings be upon him) did not pray; while Bilal (may Allah be pleased with him) said: He (peace and blessings be upon him) prayed.
Hadith Referenceالمعجم الكبير للطبراني / باب الفاء / 15836