Vorch-dog-baghk, Kahless!
Vorch-dog-baghk, Kahless! (English translation, "All hail, Kahless!") was the ritual greeting for Kahless the Unforgettable. The greeting was accompanied with kneeling. 

In 2369, when the clone of  appeared in the lava caves on Boreth, the Klingons present, save for Worf, greeted him with this greeting. Later, when Kahless invited Chancellor Gowron to join with him and usher in a new era in Klingon history, the chancellor indicated his assent to this invitation by kneeling and saying this greeting. ()
Klingonese