וְעַתָּ֗ה כְּבֹאִי֙ אֶל־עַבְדְּךָ֣ אָבִ֔י וְהַנַּ֖עַר אֵינֶ֣נּוּ אִתָּ֑נוּ וְנַפְשׁ֖וֹ קְשׁוּרָ֥ה בְנַפְשֽׁוֹ׃
Now therefore when I come to thy servant my father, and the lad is not with us; seeing that his soul is bound up with the lad’s soul;
Read kabbalistic (mystical) interpretation of Genesis 44:30: and classical mystical sources.