Musannaf Ibn Abi Shayba 8:1711

Abu Bakr narrated to us, he said: Yazid bin Harun narrated to us, from Muhammad bin Salim, from Ibn Abi Najih, from Mujahid and 'Ata, that they both disliked that the soil of the Haram be taken out, meaning to the Hill (the area outside the sacred boundaries).