Song of Solomon 8:6-7

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. {cruel: Heb. hard} Many waters cannot quench love, neither can the floods drown it: if {a} man would give all the substance of his house for love, it would utterly be contemned.