Psalm 89.20
Septuagint

euron Dauid ton doulon mou, 
en eleei agiw ecrisa auton 

New Testament - Acts 13.22

euron Dauid ton tou Iessai, andra kata thn kardian mou, oV poihsei panta ta qelhmata mou

Septuagint

I have found David my servant; I have anointed him by my holy mercy

New Testament

I have found David the son of Jesse, a man after my heart, who shall do all my will

Masoretic Text

I have found David my servant; With my holy oil have I anointed him

Comments:  The NT, LXX and the MT agree.  See 1 Samuel 13.14 for the continuation of this quotation.