vayomer Elokim yehi-or vayehi-or - G-d said, 'Let there be light.'

Remez: This is an allusion to Messianic times.  The period of the kingdom of the Mashiach is alluded to in Yeshayahu 60:1 "Arise, shine, for  your light has dawned; the Presence of Hashem has shone upon you."