'Let There Be' in the Bible

And Moses said to Aaron and to Eleazar and Ithamar, his sons, Do not let your hair be loose, and give no signs of grief; so that death may not overtake you, and his wrath come on all the people; but let there be weeping among your brothers and all the house of Israel for this burning of the Lord's fire.

Let there be no hate in your heart for your brother; but you may make a protest to your neighbour, so that he may be stopped from doing evil.

Say to the children of Israel, In the seventh month, on the first day of the month, let there be a special day of rest for you, a day of memory, marked by the blowing of horns, a meeting for worship.