Musannaf Ibn Abi Shaybah 27410 — The people of dhimmah and initiating

Awn bin Abdullah said: Muhammad bin Ka'b asked Umar bin Abd al-Aziz about being the first to greet the protected non-Muslims (dhimmis). He said: "They are to be answered with the greeting, and you should not be the first to greet them." I said: "And what do you yourself say?" He said: "There is no harm in your also being the first to greet them." I said: "Why?" He said: "Because of the saying of Allah, the Lord of Might: 'So overlook them and say: Peace. Soon they will come to know.' [Surah Az-Zukhruf: 89]"