Genesis 15.5
Septuagint

exhgage de auton exw, kai eipen autw, anableyon de eiV ton ouranon, kai ariqmhson touV asteraV, ei dunhsh exariqmhsai autouV:  kai eipen, 
outwV estai to sperma sou

New Testament - Romans 4.18

oV par elpida ep elpidi episteusen eiV to genesqai auton patera pollwn eqnwn kata to eirhmenon: 

outwV estai to sperma sou

Septuagint

And he brought him out and said to him, Look up now to heaven, and count the stars, if thou shalt be able to number them fully, and he said, Thus shall thy seed be

New Testament

Who in hope believed against hope, to the end that he might become a father of many nations, according to that which had been spoken, So shall thy seed be

Masoretic Text

And he brought him forth abroad, and said, Look now toward heaven, and number the stars, if thou be able to number them:  and he said unto him, So shall thy seed be

Comments:  The NT, LXX and MT agree.