"You are a Cohen forever, to be compared with Malki-Tzedek."

Psalm 110 ( Jewish Bible)
A psalm of David: 

ADONAI says to my Lord, "Sit at my right hand, until I make your enemies your footstool." 2 ADONAI will send your powerful scepter out from Tziyon, so that you will rule over your enemies around you. 3 On the day your forces mobilize, your people willingly offer themselves in holy splendors from the womb of the dawn; the dew of your youth is yours. 4 ADONAI has sworn it, and he will never retract -"You are a cohen forever, to be compared with Malki-Tzedek." 5 Adonai at your right hand will shatter kings on the day of his anger. 6 He will pass judgment among the nations, filling it with dead bodies; he will shatter heads throughout an extensive territory. 7 He will drink from a stream as he goes on his way; therefore he will hold his head high.