וְאֶת־בִּנְיָמִין֙ אֲחִ֣י יוֹסֵ֔ף לֹא־שָׁלַ֥ח יַעֲקֹ֖ב אֶת־אֶחָ֑יו כִּ֣י אָמַ֔ר פֶּן־יִקְרָאֶ֖נּוּ אָסֽוֹן׃
But Benjamin, Joseph’s brother, Jacob sent not with his brethren; for he said: ‘Lest peradventure harm befall him.’
Read kabbalistic (mystical) interpretation of Genesis 42:4: and classical mystical sources.