What is the ruling on swearing by divorce among friends? And does it take effect or not?

Scholars have differed regarding the ruling on swearing by divorce, whether among friends or others. The majority of them hold that divorce occurs upon breaking the oath, and this is the relied-upon opinion for fatwa. Some scholars, like Ibn Taymiyyah, are of the view that its ruling is like swearing by Allah, so if the oath is broken, the one who swore must offer an expiation for an oath, and divorce does not occur thereby. The permissible oath is swearing by Allah Almighty. As for swearing by divorce, it is among the oaths of the wicked, and it is forbidden according to some scholars and disliked according to others.