Nafi' (may Allah have mercy on him) says: Whenever Ibn Umar (may Allah be pleased with them both) went to Makkah, he would spend the night at Dhu Tuwa, take a bath (ghusl) in the morning, then enter Makkah during the day, and he would say that the Prophet (peace and blessings be upon him) used to do the same.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9199