This blue-eyed hag was hither brought with child
And here was left by the sailors. Thou, my slave,
As thou report’st thyself, was then her servant,
And, for thou wast a spirit too delicate
To act her earthy and abhorred commands,
Refusing her grand hests, she did confine thee.

– William Shakespeare

The Tempest, Act 1, Scene 2. An iritated Prospero spells out to Ariel his indebtedness to his master. He tells him that when he was in the service of the witch Sycorax, she abused and enslaved him after he refused to carry out her commands. She imprisoned him in a cloven pine tree.