Song of Solomon 8:6-7 RSV

6 Set me as a seal upon your heart, as a seal upon your arm; for love is strong as death, jealousy is cruel as the grave. Its flashes are flashes of fire, a most vehement flame.
7 Many waters cannot quench love, neither can floods drown it. If a man offered for love all the wealth of his house, it would be utterly scorned.