This is another article in the chapter Enormities from the classical manual on Sharia called Reliance of the Traveller. The articles are posted one by one in the order they are given in the book.
p23.0 THE ENGULFING OATH
p23.1 An engulfing oath is one in which there is premeditated lying. It is termed engulfing because it whelms its swearer in sin.
p23.2 The Prophet (Allah bless him and give him peace) said:
(1) “The enormities are worshipping others with Allah, showing disrespect to parents, killing a human being, and the engulfing oath.”
(2) “A man once said, ‘By Allah, Allah will not forgive So-and-so.’ Allah said, ‘Who is it that swears I must not forgive So-and-so? I forgive him and annul all your works.’ “