For Moses said, 'The Lord your God will raise up for you a prophet like me from among your brothers. You must listen to Him in everything He tells you. Everyone who does not listen to Him will be completely cut off from among his people.'
If anyone does not humble himself on this day, he must be cut off from his people.
Significance
Acts 3:23's "cut off" language (exolethreuthēsetai ek tou laou, "will be utterly destroyed from the people") conflates Deut 18:15-20's "cut off" penalty for rejecting the prophet-like-Moses with the Day of Atonement "cut off" formula from Lev 23:29. The LXX term exolethreuthēsetai ("will be utterly destroyed/cut off") in Acts 3:23 is stronger than the standard Deuteronomic karath (simply "cut off"), and the intensified form corresponds more closely to the Levitical ve-nikhrethah hanefesh hahi ("that soul shall be cut off") of Lev 23:29. This conflation is typical of Second Temple citation practice and suggests Peter is applying not only the Deuteronomic prophet-text but the broader Levitical principle of covenant exclusion for those who fail to respond to God's appointed means of grace.
Found via
G.K. Beale & D.A. Carson (eds.), Commentary on the New Testament Use of the Old Testament