ויאמר אלוקים יהי אור ויהי אור (בראשית א:ג)

Why, by all other days of creation,n it says “ויהי כן” – and it was so, and by light it says “ויהי אורant there was light?” Since the other creations remained as Hashem noted, the Possuk says. .ויהי כ.ן However, by the light, it says “וימנע מרשעים אורם” – Hashem withheld light from the wicked (איוב לח:טו) – and Hashem hid it for tzaddikim when Moshiach will come – that is why it says “ויהי אור.”