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Worf undertakes the ak'voh ritual.

Ak'voh was an ancient Klingon rite which involved a warrior guarding the body of a deceased from predators in order to allow the slayed individuals soul to leave the shell and enter Sto-vo-kor. (DS9 episode: "The Ship")

In 2374, Data described the Atrean ritual of tai-lun as being somewhat similar to ak'voh. (TNG novel: Immortal Coil)

The Ak'voh rite was a Klingon death song. The children's version, as presented by Kang for DaqS, son of Kang:

The blood on your face is that of your foe

The fire that burns toward you will temper your blade,

The Halls are Waiting, the Halls are Waiting!

Each carrion-eater that attacks shall lose an eye,

You will wear their teeth around your neck,

Their fur as your cloak, their spines on your boots,

The Halls are Waiting, the Halls are Waiting!

The serpent that bites you with poison will die itself,

Its jaws pried apart as you force the poison from you...

- (novel: Excelsior: Forged in Fire)

Connections

Ak'voh article at Memory Alpha, the wiki for canon Star Trek.