And Allah has said (in Surah An-Nahl) «ولا تتخذوا أيمانكم دخلا بينكم فتزل قدم بعد ثبوتها وتذوقوا السوء بما صددتم عن سبيل الله ولكم عذاب عظيم‏» : "And do not make your oaths a means of discord among yourselves, lest a foot should slip after being firmly planted, and you taste the punishment of the Fire for having hindered (men) from the path of Allah, and you will have a severe punishment." In this verse, the word «دخلا» means deceit and fraud. The meaning of «غمس» is to drown.

Narrated `Abdullah bin `Amr: The Prophet said, "The biggest sins are: To join others in worship with Allah; to be undutiful to one's parents; to kill somebody unlawfully; and to take an oath Al-Ghamus.