(8) CHAPTER. Whoever does not give up lying speech (false statements (i.e., telling lies) and acting on those while observing Saum (fast).
1903. Narrated Abu Hurairah: The Prophet, peace be upon him, said, “Whoever does not give up lying speech (false statements) and acting on those lies and evil actions etc., Allah is not in need of his leaving his food and drink [i.e., Allah will not accept his Saum (fasting)]”.