Deuteronomy 18.19
Septuagint

kai o anqrwpoV oV 
ean mh akoush
osa an lalhsh 
o profhthV ekeinoV epi tw onomati mou, 
egw ekdikhsw ex autou

New Testament - Acts 3.23

estai de pasa yuch htiV
ean mh akoush

tou profhtou ekeino
exoleqreuqhsetai ek tou laou

Septuagint

And whatever man shall not hearken to whatsoever words that prophet shall speak in my name, I will take vengeance on him

New Testament

And it shall be, that every soul that shall not hearken to that prophet, shall be utterly destroyed from among the people 

Masoretic Text

And it shall come to pass, that whosoever will not hearken unto my words which he shall speak in my name, I will require it of him

Comments:  The NT, LXX and MT agree.  Clearly, a very loose quotation.  It appears that Acts 3.23 is a conflation of Deuteronomy 18.19 and Leviticus 23.29.