וְהָיָ֗ה כִּרְאוֹת֛וֹ כִּי־אֵ֥ין הַנַּ֖עַר וָמֵ֑ת וְהוֹרִ֨ידוּ עֲבָדֶ֜יךָ אֶת־שֵׂיבַ֨ת עַבְדְּךָ֥ אָבִ֛ינוּ בְּיָג֖וֹן שְׁאֹֽלָה׃
it will come to pass, when he seeth that the lad is not with us, that he will die; and thy servants will bring down the gray hairs of thy servant our father with sorrow to the grave.
Read kabbalistic (mystical) interpretation of Genesis 44:31: and classical mystical sources.