וַיֹּ֨אמֶר אֲלֵהֶ֤ם יוֹסֵף֙ בַּיּ֣וֹם הַשְּׁלִישִׁ֔י זֹ֥את עֲשׂ֖וּ וִֽחְי֑וּ אֶת־הָאֱלֹהִ֖ים אֲנִ֥י יָרֵֽא׃
And Joseph said unto them the third day.’ This do, and live; for I fear God:
Read kabbalistic (mystical) interpretation of Genesis 42:18: and classical mystical sources.