King James Version (KJV)
And he said unto Jether his firstborn, Up, {and} slay them. But the youth drew not his sword: for he feared, because he {was} yet a youth.
Modern English
He said to Jether his firstborn, “Get up, and kill them!” But the youth didn’t draw his sword; for he was afraid, because he was yet a youth.
Hebrew
וַיֹּ֙אמֶר֙ לְיֶ֣תֶר בְּכוֹר֔וֹ ק֖וּם הֲרֹ֣ג אוֹתָ֑ם וְלֹא־שָׁלַ֨ף הַנַּ֤עַר חַרְבּוֹ֙ כִּ֣י יָרֵ֔א כִּ֥י עוֹדֶ֖נּוּ נָֽעַר׃
vayoʾmer lyeter bkvorvo qvm harog ʾvotam vloʾ-shalaf hanaʿar ḥarbvo kiy yareʾ kiy ʿvodenv naʿar