Answer:
A serpent swam in a silver urn, A golden bird did in its mouth abide, The serpent drank the water, this in turn, Killed the serpent. Then the gold bird died.
Scythe of darkness, Shadow’s light. Guiding eye of thirteenth sight.
What tastes better than it smells?
When there is fire in me then I am still cold. When I own your true love’s face then you will not see me. To all things I give no more than I am given. In time I may have all things, and yet I can keep nothing.
They can be harbored, but few hold water. You can nurse them, but only by holding them against someone else. You can carry them, but not with your arms. You can bury them, but not in the earth.
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?