What does Leviticus 26:37 say in the KJV?

And they shall fall one upon another, as it were before a sword, when none pursueth: and ye shall have no power to stand before your enemies.

A description of consequences for disobedience within the Mosaic Law.

King James Version (public domain)

Traditionally attributed to Moses · c. 13th century BC · The Pentateuch — Genesis, Exodus, Leviticus, Numbers, and Deuteronomy — is traditionally attributed to him

Context

35As long as it lieth desolate it shall rest; because it did not rest in your sabbaths, when ye dwelt upon it.

36And upon them that are left alive of you I will send a faintness into their hearts in the lands of their enemies; and the sound of a shaken leaf shall chase them; and they shall flee, as fleeing from a sword; and they shall fall when none pursueth.

37And they shall fall one upon another, as it were before a sword, when none pursueth: and ye shall have no power to stand before your enemies.

38And ye shall perish among the heathen, and the land of your enemies shall eat you up.

39And they that are left of you shall pine away in their iniquity in your enemies’ lands; and also in the iniquities of their fathers shall they pine away with them.