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.