וְאֶת־אֲחִיכֶ֤ם הַקָּטֹן֙ תָּבִ֣יאוּ אֵלַ֔י וְיֵאָמְנ֥וּ דִבְרֵיכֶ֖ם וְלֹ֣א תָמ֑וּתוּ וַיַּעֲשׂוּ־כֵֽן׃
Lalu bawalah adikmu yang bungsu kepadaku, supaya perkataanmu terbukti benar dan kamu tidak mati.” Maka mereka pun berbuat demikian.
Rashi
ויאמנו דבריכם— means so shall your words be verified and confirmed. Other examples are, (Numbers 5:22) “It is true, it is true (אמן אמן)”, and (1 Kings 8:26) “Let thy word, I pray thee, be verified (יאמן).”
Sforno
ולא תמותו, he meant that they would not die here, as he was able to have them killed also in the land of Canaan if they would not come back of their own free will.