Genesis 48.4
Septuagint

kai eipe moi, idou egw auxanw se, kai plhqunw se, kai poihsw se eiV sunagwgaV eqnwn:  kai dwsw soi thn ghn tauthn, kai
tw spermati sou meta se, eiV katascesin aiwnion
 

New Testament - Acts 7.5

kai ouk edwken autw klhronomian en auth oude bhma podoV kai ephggeilato 
dounai autw eiV katascesin authn kai 
tw spermati autou met auton, ouk ontoV autw teknou

Septuagint

and said to me, Behold, I will increase thee, and multiply thee, and will make of thee multitudes of nations; and I will give this land to thee, and to thy seed after thee, for an everlasting possession 

New Testament

and he gave him none inheritance in it, no, not so much as to set his foot on:  and he promised that he would give it to him in possession, and to his seed after him, when as yet he had no child

Masoretic Text

and said unto me, Behold, I will make thee fruitful, and multiply thee, and I will make of thee a company of nations, and will give this to thy seed after thee for an everlasting possession

Comments:  The NT, LXX and MT agree.  This appears to be more of an allusion than a quotation.