Deuteronomy 8:19

8:19 Now if you forget the Lord your God at all ¹  and follow other gods, worshiping and prostrating yourselves before them, I testify to you today that you will surely be annihilated.

Deuteronomy 13:2

13:2 and the sign or wonder should come to pass concerning what he said to you, namely, “Let us follow other gods” – gods whom you have not previously known – “and let us serve them.”

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¹ tn Heb “if forgetting, you forget.” The infinitive absolute is used for emphasis; the translation indicates this with the words “at all” (cf. KJV).