Psalm 110.4
Septuagint

wmosen kurioV kai ou metamelhqhsetai 
su iereuV eiV ton aiwna, kata thn taxin Melcisedek

 

New Testament - Hebrews 5.6

su iereuV eiV ton aiwna kata thn taxin Melcisedek

Hebrews 7.17, 21

su iereuV eiV ton aiwna, kata thn taxin Melcisedek ... 
wmosen kurioV kai ou metamelhqhsetai:  
su iereuV eiV ton aiwna

Septuagint

The Lord sware, and will not repent, Thou art a priest for ever, after the order of Melchisedec

New Testament

Hebrews 5.6:  Thou art a priest for ever After the order of Melchizedek

Hebrews 7.17, 21:  Thou art a priest for ever After the order of Melchizedek ... The Lord sware and will not repent himself, Thou art a priest for ever

Masoretic Text

Thou art a priest for ever After the order of Melchizedek

Comments:  The NT, LXX and MT agree.