Is seeking forgiveness for a sin considered a covenant, the breach of which would nullify the covenant, or do covenants have specific forms and wordings that differ from the rulings of repentance and seeking forgiveness?

Seeking forgiveness (Istighfar) for a sin is a servant's request to God for forgiveness, covering, and pardon. As for a covenant (Ahad), it is a commitment to a legitimate matter with God or with people, and it must be fulfilled. Breaking it is a characteristic of hypocrites. Among its forms are: "By the covenant of God" ('Ala Ahad Allah) and "The covenant of God" (Ahad Allah), and it is considered an oath.