What is the ruling on returning to smoking shisha after making a covenant with Allah to abandon it during the Friday prayer, and does that entail an expiation?

A Muslim must fulfill his covenants, especially those made with Allah, particularly if the covenant involves abandoning a sin. Scholars differ on the ruling concerning one who says, "I covenant with Allah to do such-and-such," and whether it is an oath or a vow and an oath. However, if the covenant was made during the Friday prayer, it appears that no verbal utterance occurred, as speaking invalidates the prayer. Mere self-talk about a vow or an oath does not incur a ruling, based on the Prophet's (peace be upon him) saying: "Indeed, Allah has pardoned for my nation what they whisper to themselves or what their souls talk about, as long as they do not act upon it or speak of it." A Muslim should have a sincere resolve to stay away from smoking to avoid what is unlawful, harmful, and a waste of money.