question #2 Sahih Muslim 1229a, Book 15, Hadith 192 : Why might someone choose to remain in Ihram after completing Umrah?

Messenger of Allah. what about people who have put off Ihram whereas you have not put it off after your ‘Umra? He said: I have stuck my hair and have driven my sacrificial animal, and would not, therefore, put off Ihram until I have sacrificed the animal.