(a) The Mother of the Believers Sayyidah Hafsah (may Allah be pleased with her) said that she said to the Prophet (peace and blessings be upon him): Why is it that the people have come out of ihram, but you (peace and blessings be upon him) have not come out of ihram from your Umrah? He (peace and blessings be upon him) said: "I have matted my hair and garlanded my sacrificial animal, so I cannot come out of ihram until I have sacrificed it."
(b) It is narrated from the Mother of the Believers Sayyidah Hafsah (may Allah be pleased with her) that she said: O Messenger of Allah (peace and blessings be upon him), what is the matter with the people, that they come out of ihram by means of Umrah, while you have not come out of ihram from your Umrah?
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8843