Sunan Ibn Majah Book 25, Hadith 97
“Imran
bin Husain said to me: ‘I will tell you a Hadith, that Allah
may
benefit you thereby after this day. Know that Allah’s Messenger
(ﷺ) had a group from his family perform ‘Umrah during the ten
(days)
of Dhul-Hijjah, and the Messenger of Allah (ﷺ) did not
forbid that,
and no abrogation of that was revealed, and it does not
matter what
anyone else suggests.’”
“The Messenger of Allah (ﷺ) stood up to deliver a speech in this valley, and said: ‘Lo! ‘Umrah has been included in Hajj until the Day of Resurrection.”
“Abu Musa Al-Ash’ari used to issue rulings concerning Tamattu’. Then a man said to him: ‘Withhold some of your rulings, for you do not know what the Commander of the Believers has introduced into the rites after you.’ (Abu Musa said:) ‘Then when I met him later on, I asked him.’ ‘Umar said: ‘I know that the Messenger of Allah (ﷺ) and his Companions did it, but I did not like that people should lie with their wives in the shade of the Arak trees and then go out for Hajj with their heads dripping,’ (i.e. due to the bath after sexual relations).”