Charles Ellicott Commentary Leviticus 26:36-37

"And as for them that are left of you, I will send a faintness into their heart in the lands of their enemies: and the sound of a driven leaf shall chase them; and they shall flee, as one fleeth from the sword; and they shall fall when none pursueth. And they shall stumble one upon another, as it were before the sword, when none pursueth: and ye shall have no power to stand before your enemies." — Leviticus 26:36-37 (ASV)

And upon them that are left alive of you. —A better rendering is, And as to those that remain of you, as the Authorized Version generally translates this expression. This makes the insertion of the expression “alive” unnecessary, as it is not in the original text and is not included in the Authorized Version in Leviticus 26:39, where the same phrase occurs. Where these will remain is explained in the next clause.

I will send a faintness into their hearts. —That is, He will implant in them such timidity and cowardice that they will be frightened by the faintest sound. He will make life a misery for them. (Compare to Deuteronomy 28:65-67.)