What is the difference between Huqooqullah and Huqooqul Ibaad?

Answer

Huqooqullaah are rights related to only Allah Ta'ala, e.g. Salaat, Saum, all acts of ibaadat, commands and prohibitions. Huqooqul Ibaad are rights which are related to people, e.g. social dealings, matrimonial relationships, rights of neighbours, financial dealings, etc.

In reality, Huqooqul Ibaad are also related to Allah Ta'ala because He has commanded us to observe these rights and obligations. Thus, if a person steals, then he violates both types of Huqooq (rights). The thief has to restore the rights of the owner of the stolen goods, and also seek forgiveness from Allah Ta'ala for his sin. Restoration of the stolen article to the owner does not absolve the thief from the sin.

It is never permissible to violate Huqooqullah in the process of fulfilling Huqooqul Ibaad. For example, to fulfil the rights of the wife, it is not permissible to resort to any haraam act, e.g. selling haraam items. A doctor may not unnecessarily adopt haraam methods to treat patients.