Musannaf Ibn Abi Shayba 18:895

Abu Bakr narrated to us, he said: Muhammad ibn Bakr narrated to us, from Ibn Jurayj, he said: 'Amr ibn Dinar and Sulayman al-Ahwal informed me that they heard Tawus saying: "In the Sacred Precinct (al-Haram) and the Sacred Month, the penalty is increased."