Sahih Muslim Book 7, Hadith Number 2836.

Chapter : The Qarin should not put off the Ihram but at the time when a Mufrid pilgrim takes it off.

Hafsa (Allah be pleased with her) said: Messenger of Allah; the rest of the Hadith is the same and (the concluding words of the Holy Prophet): “I won’t put off Ihram until I have sacrificed the animal.”