The Book of Pilgrimage (Kitab Al-Hajj)

Muslim :: Book 7 : Hadith 2861

Ibn 'Abbas (Allah be pleased with them) reported: Allah's Messenger (may peace be upon him) came along with his Companions when four days had passed out of ten days (of Dhu'l-Hijja) and they were pronouncing Talbiya for Hajj, and he (the Holy Prophet) commanded them to change (this Ihram) into that of 'Umra.