‘Abdullah ibn Mas‘ūd (may Allah be pleased with him) reported the following as Marfū‘ Hadīth: Regarding the statement of Allah, the Exalted and Majestic: {And whoever intends to deviate therein by evildoing, We will cause him to taste a painful punishment} [Surat al-Hajj: 25], he said: "If a man intended to commit deviation in it while being in Adan of Abyan (a city in Yemen), Allah would make him taste a painful punishment."
‘Abdullah ibn Mas‘ūd (may Allah be pleased with him) mentioned regarding the statement of Allah Almighty: {And whoever intends to deviate therein by evildoing, We will cause him to taste a painful punishment} [Surat al-Hajj: 25]. He said: If anyone intended and resolved to commit an evil deed in the sacred sanctuary of Makkah—violating its sanctity by words or intentional killing that Allah has forbidden—this is considered wrongdoing. Even if this intention and resolve occurred in the city of ‘Adan in Yemen, he deserves Allah's painful punishment because of it, even if he does not carry it out. It is enough that he made the resolve.