Is it permissible to combine the farewell tawaf with the tawaf of ifadhah? And does one obligatory act suffice for another obligatory act?

Is it possible to combine the farewell tawaf with the tawaf of ifadhah so that they count as one tawaf?

The Shaykh : It is not permissible to combine the farewell tawaf with the tawaf of ifadhah, because the tawaf of ifadhah is a pillar of Hajj, and Hajj is not valid without it. The farewell tawaf is obligatory, though it may be waived due to an excuse, such as for a menstruating woman or a woman with post-natal bleeding, who may force the caravan to delay for her sake. The Prophet (peace and blessings be upon him) waived the farewell tawaf for a menstruating woman who had already performed the tawaf of ifadhah while in a state of purity. Therefore, take this as a rule: an obligatory act does not suffice for another obligatory act, and an obligatory act does not suffice for another obligatory act. The terms "fard" (obligatory) and "wajib" (obligatory) mean the same thing; it is merely a variation in expression. This also has other details, but I do not wish to prolong this for myself or for you. The summary is that the tawaf of ifadhah does not suffice for the farewell tawaf, because the farewell tawaf is obligatory.