כָּל־הַ֠נֶּפֶשׁ הַבָּאָ֨ה לְיַעֲקֹ֤ב מִצְרַ֙יְמָה֙ יֹצְאֵ֣י יְרֵכ֔וֹ מִלְּבַ֖ד נְשֵׁ֣י בְנֵי־יַעֲקֹ֑ב כָּל־נֶ֖פֶשׁ שִׁשִּׁ֥ים וָשֵֽׁשׁ׃
All the souls belonging to Jacob that came into Egypt, that came out of his loins, besides Jacob’s sons’wives, all the souls were threescore and six.
Read kabbalistic (mystical) interpretation of Genesis 46:26: and classical mystical sources.