Say: “(But) the things that my Lord has indeed forbidden are the Fawahish (immoral deeds) whether committed openly or secretly, and Ithm, and transgression without right, and joining partners with Allah for which He has given no authority, and saying things about Allah of which you have no knowledge.”
Surah Al-A’raf (7:33)
Interpretation of meaning:
Allah has indeed forbidden are the Fawahish (immoral deeds,great evil sins, every kind of unlawful sexual intercourse,) whether committed openly or secretly.(and Ithm, and transgression without right) means disobedience’. As for unrighteous oppression, it occurs when you transgress against people without justification.Ithm includes all types of disobedience. Allah said that the oppressor commits oppression against himself.Therefore, the meaning of, Ithm is the sin that one commits against himself, while `oppression’ pertains to transgression against other people, and Allah prohibited both.
Allah prohibits calling partners with Allah in worship.(and saying things about Allah of which you have no knowledge.) such as lies and inventions, like claiming that Allah has a son, and other evil creeds that you — O idolators — have no knowledge of.