The ruling on working for non-Muslims

Assalamu alaikum. What is the ruling for a Muslim working for non-Muslims?

There is no issue with working for non-Muslims or being partners in business with them. The Prophet PBUH and his Companions used to be involved in all kinds of businesses with non-Muslims; trade, rent and hiring.

Source:

Fatwa from the Qatari Fatwa Authority (Arabic PDF)