Sunan Abi Dawud Book 42, Hadith 49
These clients (i.e., non-Arabs) are to be struck and cut off. I swear by Allah, if I strike a stick with a stick, I would annihilate them like the day that passed away. Al-hamra means clients or non-Arabs.
I heard al-Hajjaj say on the pulpit: Fear Allah as much as possible; there is no exception in it. Hear and obey the Commander of the Faithful ‘Abd al-Malik; there is no exception in it. I swear by Allah, if order people to come but from a certain gate of the mosque, and they come out from another gate, their blood and their properties will be lawful for me. I swear by Allah, if I seize the tribe of Rabi’ah for the tribe of Mudar, it is lawful for me from Allah. Who will apologies to me for the slave of Hudhail (i.e. ‘Abd Allah b. Mas’ud) who thinks that his reading of the Quran is from Allah. I swear by Allah, it is a rhymed prose of the Bedouins. Allah did not reveal it to his Prophet (ﷺ). Who will apologies to me for these clients (non-Arab). One of them thinks that he will throw a stone and when it falls (on the ground) he says: Something new has happened. I swear by Allah, I shall leave them (ruined and perished) like the day that passes away.
He said: I mentioned it to al-A’mash. He said: I swear by Allah, I heard it from him.
I prayed the Friday prayer with al-Hajjaj and he addressed. He then transmitted the tradition of Abu Bakr b. ‘Ayyash. He said in it: Hear and obey the caliph of Allah and his select ‘Abd al-Malik bin Marwan. He then transmitted the rest of the tradition, and said: If I seized Rabi’ah for Mudar. But he did not mention the story of the clients (i.e. non Arabs).