The ruling on one who leaves the farewell tawaf out of ignorance

Question:
Leaving the farewell tawaf out of ignorance?

Answer:
He has to go back and perform the farewell tawaf, or slaughter a sheep in Makkah for the poor and the needy as expiation for leaving an obligatory act; because the farewell tawaf is one of the obligatory acts of Hajj. If he leaves it, he either returns, and that suffices him—Allah willing—according to the stronger of the two opinions. And if he pays the expiation and slaughters in Makkah for leaving the farewell tawaf, that also suffices him, just as if he left the stoning of the pillars and slaughtered the blood, that would suffice him.
But he must not intentionally leave it; it is not permissible for him to intentionally leave it. Rather, he commits a sin if he intentionally leaves the stoning of the pillars, or leaves some of it, or leaves the farewell tawaf. It is not permissible for him to do that; he commits a sin. But if he did so and the time passed, then the blood is required of him.
Likewise, if he leaves the farewell tawaf intentionally, he commits a sin. Or if he does so out of ignorance, or forgetfulness, he returns and performs it, or expiates for it with a one-year-old goat, or a six-month-old lamb, like the 'Id sacrifice.