It is narrated from Umm al-Mu'mineen Aisha Siddiqa (may Allah be pleased with her) that the very first act which the Messenger of Allah (peace and blessings be upon him) did upon arriving in Mecca was that he performed ablution, then performed Tawaf, and at that time, only performing Tawaf did not constitute Umrah. Then the Commander of the Faithful Abu Bakr Siddiq and our master Umar Farooq (may Allah be pleased with them both) also performed Hajj in the same manner.