Commentaries:
Jamieson, Fausset, and Brown
thou shalt surely kill him—not hastily, or in a private manner, but after trial and conviction; and his relative, as informer, was to cast the first stone (see on Deuteronomy 17:2; Acts 7:58). It is manifest that what was done in secret could not be legally proved by a single informer; and hence Jewish writers say that spies were set in some private part of the house, to hear the conversation and watch the conduct of a person suspected of idolatrous tendencies.
Other Jamieson, Fausset, and Brown entries containing Deuteronomy 13:9:
Deuteronomy 13:6
2 Chronicles 21:13-19
Job 31:28
Zechariah 13:3
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