Deuteronomy 19.15
Septuagint


epi stomatoV duo marturwn, 
kai epi stomatoV triwn marturwn,
sthsetai pan rhma

 

New Testament - Matthew 18.16

ean de mh akoush, paralabe meta sou eti ena h duo, ina 
epi stomatoV duo 
marturwn h triwn 
staqh pan rhma

2 Corinthians 13.1

triton touto ercomai proV umaV: 
epi stomatoV duo 
marturwn kai triwn 
staqhsetai pan rhma

Septuagint

by the mouth of two witnesses, or by the mouth of three witnesses, shall every word be established
 

New Testament

Matthew 18.16:  But if he hear thee not, take with thee one or two more, that at the mouth of two witnesses or three every word may be established

2 Corinthians 13.1:  This is the third time I am coming to you.  At the mouth of two witnesses or three shall every word be established

Masoretic Text

at the mouth of two witnesses, or at the mouth of three witnesses, shall a matter be established

Comments:  The NT, LXX and MT agree.