C. F. Keil and Franz Delitzsch on Numbers 14:36-38

Num 14:36-38

But for the purpose of giving to the whole congregation a practical proof of the solemnity of the divine threatening of punishment, the spies who had induced the congregation to revolt, through their evil report concerning the inhabitants of Canaan, were smitten by a “stroke before Jehovah,” i.e., by a sudden death, which proceeded in a visible manner from Jehovah Himself, whilst Joshua and Caleb remained alive.