Tawaf is not valid except from behind the Black Stone, not from inside it

Question : Do we circle from behind the Black Stone, or between it and the Ka'bah?

Answer : behind it, because most of the Hajar al-Aswad (Black Stone) is part of the Ka'bah, and it is said that all of it is part of the Ka'bah. The scholars hold that approximately six and a half cubits of the stone are part of the Ka'bah, meaning three and a quarter meters from the Ka'bah, and the rest is outside of it. Nevertheless, it is obligatory to circumambulate behind the stone. Yes, based on the saying of Allah the Exalted: "And let them circumambulate the ancient House." The preposition "bi" (with) indicates comprehensiveness. If it had said "let them circumambulate in the House," it would have been permissible to include the mountains that serve as a barrier for the construction of the Ka'bah. But it says "circumambulate with the House," and the "bi" is for comprehensiveness, just as in His saying: "And that you may not wrong yourselves."