What are the consequences for me if I lie after having said to myself during prayer: "I covenant with You, my Lord, that I will not lie"? And does an expiation for breaking an oath (kaffarat yamin) become binding upon me? And is it necessary to utter it audibly for the expiation to become binding? And is another expiation binding upon me if I lie after performing the expiation? Or would I then be among the hypocrites?
If the words of a vow are uttered in a low voice, even if not heard, it is sufficient to establish its ruling, and a compensatory expiation (kaffarat yamin) becomes due if it is broken. As for self-talk (hadith al-nafs), nothing is entailed by it. It is obligatory to abandon lying, as it leads to hypocrisy.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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