Fiqh-us-Sunnah Volume 5, Hajj and ‘Umrah, Fiqh 5.031C.

This means clipping one’s fingernails, trimming the moustache, shaving off the hair from under the armpits, shaving the pubic hair, making an ablution or preferably taking a complete bath, and in the case of men, to comb their beard and hair.

Ibn ‘Umar said: “It is sunnah for a pilgrim to take a complete bath before entering the state of ihram or before entering Makkah.” This is reported by Al-Bazzar, Ad-Daraqutni, Al-Hakim, who considers it a sound hadith.

It is reported from Ibn ‘Abbas that Allah’s Messenger (peace be upon him) said: “A woman in the state of confinement after childbirth and one in her menstruation period must take a complete bath, declare her ihram, and perform all the rites except circumambulation around the Ka’bah, which she may perform after she is in a state of purification.” (Ahmad, Abu Dawud, and Tirmizhi who considers this hadith sound)