Guidelines for Dealing with the Disbeliever in the Workplace

Question:
May Allah grant you success. We have a Jew at our workplace, so how should we deal with him? Is it permissible to laugh with him and talk to him?

Answer:
It is not permissible to bring disbelievers into these lands, whether they are Jews, Christians, or polytheists. It is not permissible to bring disbelievers into the Arabian Peninsula, because the Prophet (peace and blessings be upon him) ordered them to be expelled from it and said, "Two religions will not remain in the Arabian Peninsula." It is not permissible. It must be made clear, and whoever brings one in must fear Allah and make it clear, and not keep him in the land of tawhid (the oneness of Allah) and the land of Muslims.
As for dealing with him in worldly matters, there is nothing wrong with it. The Messenger dealt with the Jews. Dealing with him in permissible matters and worldly affairs is fine, such as buying and selling. However, do not initiate the salam, and do not show him joy, because that means approving of what he is upon. But do not be harsh with him or wrong him. It is not permissible to wrong anyone, even a disbeliever. Do not wrong him and do not be harsh with him.