A rare poem written by Anne Frank has sold for $148,000.

The handwritten poem was written to the older sister of Frank's best friend.

According to the auction house, the sale price was four or five times what was expected.

They also said "it is a typically edifying poem of the sort that was often written in 'friendship books,' exhorting the owner to do her best and be diligent at work."

The buyer remained anonymous.

The poem reads:

Dear Cri-Cri,

If you did not finish your work properly,

And lost precious time,

Then once again take up your task

And try harder than before.

If others have reproached you

For what you have done wrong,

Then be sure to amend your mistake.

That is the best answer one can make.

In memory of,

Anne Frank