Deuteronomy 32.35
Septuagint

en hmera ekdikhsewV antapodwsw
New Testament - Romans 12.19

emoi ekdikhsiV, egw antapodwsw
Septuagint

In the day of vengeance I will recompense
New Testament

Vengeance belongeth unto me; I will recompense, saith the Lord
Masoretic Text

Vengeance is mine, and recompense
Comments:  The quotation appears to follow the MT more closely in the first clause, and the LXX in the second.  See also Hebrews 10.30.