What did Prophet Muhammad (peace be upon him) instruct the pilgrims to do if they had acquired the Hadi during Hajjat-ul-Wada`, as mentioned by `Aisha (may Allah be pleased with her)?
 Narrated `Aisha:                     We went out with Allah's Apostle during Hajjat-ul-Wada` and we assumed the Ihram for `Umra. Then Allah's Apostle said to us, "Whoever has got the Hadi should assume the Ihram for Hajj and `Umra and should not finish his Ihram till he has performed both (`Umra and Hajj)." I arrived at Mecca along with him (i.e. the Prophet ) while I was menstruating, so I did not perform the Tawaf around the Ka`ba or between Safa and Marwa. I informed Allah's Apostle about that and he said, "Undo your braids and comb your hair, and then assume the lhram for Hajj and leave the `Umra." I did so, and when we performed and finished the Hajj, Allah's Apostles sent me to at-Tan`im along with (my brother) `Abdur-Rahman bin Abu Bakr As-Siddiq, to perform the `Umra. The Prophet said, "This `Umra is in lieu of your missed `Umra." Those who had assumed the lhram for `Umra, performed the Tawaf around the Ka`ba and between Safa and Marwa, and then finished their Ihram, and on their return from Mina, they performed another Tawaf (around the Ka`ba and between Safa and Marwa), but those who combined their Hajj and `Umra, performed only one Tawaf (between Safa and Marwa) (for both).