Psalm 40.6-8
Septuagint


qusian kai prosforan ouk hqelhsaV,
swma de kathrtisw moi:
olokautwma kai peri amartiaV 
ouk hthsaV.
tote eipon, idou hkw:
en kefalidi bibliou gegraptai peri emou,
tou poihsai to qelhma sou o qeoV
mou hboulhqhn,
kai ton nomon sou em mesw thV kardiaV mou

New Testament - Hebrews 10.5-7

Dio eisercomenoV eiV ton kosmon legei:
qusian kai prosfaran ouk hqelhsaV,
swma de kathrtisw moi:
olokautwmata kai peri amartiaV
ouk eudokhsaV.
tote eipon:  idou hkw,
en kefalidi bibliou gegraptai peri emou,
tou poihsai o qeoV to qelhma sou

 

Septuagint

Sacrifice and offering thou wouldest not; but a body hast thou prepared me:  whole-burnt-offering and sacrifice for sin thou didst not require.  Then I said, Behold, I come:  in the volume of the book it is written concerning me, I desired to do thy will, O my God, and thy law in the midst of mine heart 

New Testament

Wherefore when he cometh into the world, he saith, Sacrifice and offering thou wouldest not, But a body didst thou prepare for me; In whole burnt offerings and sacrifices for sin thou hadst no pleasure:  Then I said, Lo, I am come (In the roll of the book it is written of me) To do thy will, O God 

Masoretic Text

Sacrifice and offering thou hast no delight in; Mine ears hast thou opened:  Burnt-offerings and sin-
offering hast thou not required.  Then I said, Lo, I am come; In the roll of the book it is written of me; I delight to do thy will, O my God; Yea, thy law is within my heart. 

Comments:  The NT author has modified the LXX only slightly in this quotation.  The MT omits the thought of the incarnation entirely, replacing “but a body hast thou prepared for me” with “mine ears hast thou opened.”