(31) باب جَوَازِ الْعُمْرَةِ فِي أَشْهُرِ الْحَجِّ
Ibn 'Abbas (Allah be pleased with them) reported:
Allah's Messenger (ﷺ) 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.
Reference: Sahih Muslim 1240 d
In-book reference: Book 15, Hadith 220
USC-MSA web (English) reference(deprecated numbering scheme): Book 7, Hadith 2861