Dagger

On his knees

He prays for life

In his heart

Is buried a knife

It rips through flesh

Sharp pointed dagger

Any who herald it

Come to stagger

A curse is befallen

To the keeper

To the bearer

To the weeper

A curse on the blade

To kill is forbade

For it's a mind its own

And to all it is known

Author's Note

I was just bored... if it doesn't make sense, here's the explanation:
The dagger is cursed so that if you kill anyone with it, it kills you.
"To harm another is to harm yourself..."