Allah (Glorified be He), and the rest of the destructive sins. Allah has informed us that their outward is forbidden and their inward is forbidden by His saying (Glorified be He) in Surah al-A'raf:

Among them are those which are forbidden outwardly and inwardly.

Among them are those which are lawful outwardly and inwardly.

Among them are those which are forbidden outwardly and lawful inwardly.

Among them are those which are lawful outwardly and forbidden inwardly.

Every one of these four categories varies into a group of types: some are Verbal, some are Action-based, and some are Volitional. I will clarify of them what is easy, in detail, with a decisive word, God willing.

Know—may Allah teach you goodness—that the category which is forbidden outwardly and inwardly:

It consists of the forbidden outward and inward immoralities [Fawahish], including food, drink, and lewd speech—such as the Submerging Oath [Al-Yamun al-Ghamus], the Oath of Disassociation [Al-Half bi al-Barara],

corrupt beliefs, the killing of a soul without right, adultery [Zina], usury [Riba] outwardly and inwardly, transgression without right,