Musannaf Ibn Abi Shaybah

Hazrat Nafi' bin Jubair narrates that Hazrat Ibn Abbas (may Allah be pleased with them) said: In the case of a person killed during the sacred months, four thousand dirhams will be added to the blood money, and in the case of a person killed within the boundaries of the Haram, four thousand dirhams will also be added to the blood money. And in the case of a person residing within the boundaries of the Haram, twenty thousand dirhams will be added to the blood money.