Musannaf Ibn Abi Shaybah 16114 — A woman or man who enters ihram

Al-Hasan says concerning a person who enters ihram for Umrah and arrives when the people are already standing at Arafat: if he is certain that he can go to Makkah (that is, going will not make him miss the Hajj), he should come out of ihram from his Umrah (that is, complete the Umrah in Makkah and return out of ihram); otherwise he should say the talbiyah for Hajj and perform two tawafs.