Genesis 15.13-14
Septuagint

kai erreqh proV Abram:  ginwskwn gnwsh oti 
paroikon estai to sperma sou en gh
ouk idia, kai doulwsousin autouV
kai kakwsousin autouV, kai tapeinwsousin autouV, 
tetrakosia ethto de 
eqnoV, w ean douleuswsi, krinw egw: 
meta de tauta, exeleusontai wde meta aposkeuhV pollhV
 

New Testament - Acts 7.6-7

elalhsen de outwV o qeoV oti 
estai to sperma autou paroikon en gh allotria 
kai doulwsousin auto 
kai kakwsousin 
eth tetrakosia: kai to 
eqnoV w ean douleusousin krinw egw, 
o qeoV eipen, kai 
meta tauta exeleusontai kai latreusousin moi en tw topw toutw

Septuagint

And it was said to Abram, Thou shalt surely know that thy seed shall be a sojourner in a land not their own, and they shall enslave them, and afflict them, and humble them four hundred years.  And the nation whomsoever they shall serve I will judge; and after this, they shall come forth hither with much property

New Testament

And God spake on this wise, that his seed should sojourn in a strange land, and that they should bring them into bondage, and treat them ill, four hundred years.  And the nation to which they shall be in bondage will I judge, said God:  and after that they shall come forth, and serve me in this place 

Masoretic Text

And he said unto Abram, Know of a surety that thy seed shall be sojourners in a land that is not theirs, and shall serve them; and they shall afflict them four hundred years; and also that nation, whom they shall serve, will I judge; and afterward shall they come out with great substance

Comments:  The NT, LXX and MT agree.