Musannaf Ibn Abi Shayba 19:667

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Sufyan, from Ibn Abi Najih, from Mujahid: "And let not pity for them withhold you in the religion of Allah." He said: Regarding the establishment of the prescribed punishment (hadd), it is to be established and not suspended.