New Revised Standard Version
But if they do not listen, they shall perish by the sword, and die without knowledge.

Contemporary English Version
But if they foolishly refuse, they will be rewarded with a violent death.

New American Bible
But if they do not listen, they pass to the grave, they perish for lack of knowledge.

Douay-Rheims Bible
But if they hear not, they shall pass by the sword, and shall be consumed in folly.

But if they hear not, they shall pass by the sword, and shall be consumed in folly.

if

Deuteronomy 18:15 The Lord thy God will raise up to thee a PROPHET of thy nation and of thy brethren like unto me: him thou shalt hear:

*etc:

Deuteronomy 29:15-20 But with all that are present and that are absent. . . .

Isaiah 1:20 But if you will not, and will provoke me to wrath: the sword shall devour you because the mouth of the Lord hath spoken it.

Isaiah 3:11 Woe to the wicked unto evil: for the reward of his hands shall be given him.

Romans 2:8,9 But to them that are contentious and who obey not the truth but give credit to iniquity, wrath and indignation. . . .

perish.

Job 4:21 And they that shall be left, shall be taken away from them: they shall die, and not in wisdom.

John 8:21-24 Again therefore Jesus said to them: I go: and you shall seek me. And you shall die in your sin. Whither I go, you cannot come. . . .