Leviticus 26:37

וכשלו איש באחיו AND THEY SHALL STUMBLE ONE UPON ANOTHER — When they are running in order to escape they will stumble one against the other because they will be in a hurry to run away. כמפני חרב AS IT WERE BEFORE THE SWORD — i. e. as though they were fleeing from before murderers. It means that in their heart there will be timidity, and at every moment they will think that somebody is pursuing them. A Midrashic explanation of וכשלו איש באחיו is: one will stumble by reason of the sin of the other (באחיו is taken in the sense of: on account of the other), for all Israelites are held responsible for one another (Sifra, Bechukotai, Chapter 7 5; Sanhedrin 27b).

וְכָשְׁל֧וּ אִישׁ־בְּאָחִ֛יו כְּמִפְּנֵי־חֶ֖רֶב וְרֹדֵ֣ף אָ֑יִן וְלֹא־תִֽהְיֶ֤ה לָכֶם֙ תְּקוּמָ֔ה לִפְנֵ֖י אֹֽיְבֵיכֶֽם׃

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