Set me as a seal on your heart, as a seal on your arm; for love is strong as death. Jealousy is as cruel as Sheol. Its flashes are flashes of fire, a very flame of the LORD. Many waters can’t quench love, neither can floods drown it. If a man would give all the wealth of his house for love, he would be utterly scorned.
Traditional attribution
Verse 1:1 says "Solomon's," which in Hebrew can mean by, for, or about.