Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates that Hafsah (may Allah be pleased with her), the wife of the Prophet (peace and blessings be upon him), said: "O Messenger of Allah! What has prevented you from leaving the state of ihram?" Then the narrator went on to relate the full hadith.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19676