וַיְצַ֥ו פַּרְעֹ֖ה בַּיּ֣וֹם הַה֑וּא אֶת־הַנֹּגְשִׂ֣ים בָּעָ֔ם וְאֶת־שֹׁטְרָ֖יו לֵאמֹֽר׃
And the same day Pharaoh commanded the taskmasters of the people, and their officers, saying:
Read kabbalistic (mystical) interpretation of Exodus 5:6: and classical mystical sources.