Deuteronomy 9.4
Septuagint

mh eiphV en th kardia sou

New Testament - Romans 10.6

mh eiphV en th kardia sou

Septuagint

Speak not in thine heart

New Testament

Say not in thy heart

Masoretic Text

Speak not thou in thy heart

Comments:  The NT, LXX and MT agree.