Deuteronomy 13:9

New English Translation

⁹Instead, you must kill him without fail!^[a] Your own hand must be the first to strike him,^[b] and then the hands of the whole community.

Deuteronomy 13:9 tn The Hebrew text uses the infinitive absolute for emphasis, which the translation indicates with the words “without fail” (cf. NIV “you must certainly put him to death”).
Deuteronomy 13:9 tn Heb “to put him to death,” but this is misleading in English for such an action would leave nothing for the others to do.

Deuteronomy 13:9

New International Version

⁹You must certainly put them to death.^(A) Your hand^(B) must be the first in putting them to death, and then the hands of all the people.

New English Translation (NET)

New International Version (NIV)