All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
narrated that the Prophet, sallallaahu ‘alayhi wa sallam, said to him when he sent him to Khaybar: “Then, invite them to Islam; by Allaah, that Allaah guides a single person by you is better for you than red camels.” [Al-Bukhari and Muslim]
For more benefit, please refer to Fatwas 86169, 81979 and 88906 about inviting non-Muslims to Islam.
We draw your attention to the fact that Muslims should hire pious Muslim workers who are competent and trustworthy; reliable Muslim workers should be given priority over non-Muslims. Allaah, The Exalted, says (what means): {Indeed, the best one you can hire is the strong and the trustworthy.} [Quran 28:26] Also, Muslims should beware of befriending non-Muslims; please refer to Fatwa 88293.
Allaah Knows best.