Gringotts is a poem by J. K. Rowling. It appeared in Harry Potter and the Philosopher's Stone, published in 1997.
This poem is displayed on a sign that appears on the front doors of the wizarding bank, Gringotts, in Diagon Alley. An eleven-year-old Harry Potter is just about to go in with Hagrid, his half-giant friend, and withdraw some money inherited from his parents for his school supplies, when he stops to read it.
Enter, stranger, but take heed
Of what awaits the sin of greed
For those who take, but do not earn
Must pay most dearly in their turn
So if you seek beneath our floors
A treasure that was never yours
Thief, you have been warned, beware
Of finding more than treasure there.