Deuteronomy 8:19
And it shall be, if thou do at all forget the Lord thy God, and walk after other gods, and serve them, and worship them, I testify against you this day that ye shall surely perish.
Cross-reference
Deuteronomy 4:26 delivers the same warning: forgetting God leads to perishing from the land — reinforcing the solemn threat here.
Deuteronomy 30:19 sets before Israel life and death, urging them to choose life — the same choice implied by the warning against idolatry here.
Deuteronomy 28:58-68 details curses for not fearing God — the same outcome of perishing warned against in this verse.
Deuteronomy 29:25-28 explains exile as the result of abandoning the covenant — exactly the consequence threatened here.
Deuteronomy 30:18 repeats nearly verbatim the warning of perishing if Israel turns away — a direct parallel within Deuteronomy.
Deuteronomy 6:14 gives the same command against following other gods, reinforcing this warning.
Deuteronomy 32:18 accuses Israel of forgetting God their Rock — the same sin warned against here.
Deuteronomy 11:17 describes the same consequence of perishing for serving other gods, echoing the warning.
Deuteronomy 11:16 gives a nearly identical warning against serving other gods, reinforcing this same warning.
1 Samuel 12:25 warns that continued wickedness leads to being swept away — the same fate as perishing for forgetting God.
Zephaniah 1:18 depicts the day of the Lord's wrath where silver and gold cannot save — a vivid picture of the perishing warned here.
2 Kings 17:13 recounts God testifying through prophets against idolatry — the same testimony as in this verse.
2 Kings 23:3 depicts a covenant to follow God wholeheartedly — the opposite of the forgetting and idolatry warned against here.
Job 8:13 states that those who forget God will perish — a direct echo of the same warning here.
Isaiah 17:10 rebukes forgetting God and seeking other sources — the same sin warned against here.
Jeremiah 7:6 warns against going after other gods to your own hurt, echoing the same prohibition.
Jeremiah 25:6 also commands not to go after other gods to serve them, reinforcing this warning.