Psalms 110:4 - Coke's Commentary on the Holy Bible

Thou art a priest for ever— The Jews have, either through design or haste, corrupted this text in such a manner that all its force with respect to its application to Christ is lost; for the literal version of the words according to the present Hebrew is, Thou art a priest for ever, according to my order, O Melchizedek, or O my just king. As this corruption is entirely owing to the addition of י jod to the word דברת dibrath, which letter is likewise corruptly added to other words, the text may be restored to its genuine purity by omitting that letter; and that it should be omitted is evident from the LXX, Vulgate, Ethiopic, and Arabic, which concur in reading the same as our English version. See Houbigant, Kennicott's Dissert. vol. 1: p. 218 and Hebrews 5:6.