For jealousy [is] the rage of a man: therefore he will not spare in the day of vengeance.
Wrath [is] cruel, and anger [is] outrageous; but who [is] able to stand before envy?
Again, I considered all travail, and every right work, that for this a man is envied of his neighbour. This [is] also vanity and vexation of spirit.
Song of Solomon 8:6
Set me as a seal upon thine heart, as a seal upon thine arm: for love [is] strong as death; jealousy [is] cruel as the grave: the coals thereof [are] coals of fire, [which hath a] most vehement flame.