כַּגּוֹיִ֗ם אֲשֶׁ֤ר יְהוָה֙ מַאֲבִ֣יד מִפְּנֵיכֶ֔ם כֵּ֖ן תֹאבֵד֑וּן עֵ֚קֶב לֹ֣א תִשְׁמְע֔וּן בְּק֖וֹל יְהוָ֥ה אֱלֹהֵיכֶֽם׃ (פ)
As the nations that the LORD maketh to perish before you, so shall ye perish; because ye would not hearken unto the voice of the LORD your God.
Read halakhic rulings (Jewish law) on Deuteronomy 8:20: and classical halakhic sources.