Deuteronomy 32.35-36
Septuagint


en hmera ekdikhsewV antapodwsw 
... oti
krinei kurioV ton laon autou

New Testament - Hebrews 10.30

oidamen gar ton eiponta: 
emoi ekdikhsiV, egw antapodwsw. 
kai palin:
krinei kurioV ton laon autou

Septuagint

In the day of vengeance I will recompense ... For the Lord shall judge his people
 

New Testament

For we know him that said, Vengeance belongeth unto me, I will recompense.  And again, The Lord shall judge his people

Masoretic Text

Vengeance is mine, and recompense ... For Jehovah will judge his people

Comments:  The quotation appears to follow the MT more closely in the first clause (Vengeance belongeth unto me), and the LXX in the second (I will recompense).  See also Romans 12.19, which contains the same quotation.