From Ovid's "Metamorphoses", Book III:

Called "Anyone here?" and Echo anwered "Here!"
Amazed he looked all round and, raising his voice,
Called "Come this way!" and Echo called "This way!"
He looked behind and, no one coming, shouted
"Why run away?" and heard his words again.
He stopped and, cheated by the answering voice,
Called "Join me here!" and she, never more glad
To give her answer, answered "Join me here!"
And graced her words and ran out from the wood
To throw her loving arms around his neck.
He bolted, shouting "Keep your arms from me!
Be off! I'll die before I yield to you!"
Shamed and rejected in the woods she hides
And has her dwelling in the lonely caves;
Yet still her love endures and grows on grief,
And weeping vigils waste her frame away;
Her body shrivels, all its moisture dries;
And only voice and bones are left; at last
Only her voice, her bones are turned to stone.
So in the woods she hides and hills around,
For all to hear, alive, but just a sound.