'Seven' in the Bible

Seven women shall take hold of one man in that day, saying, "We will eat our own bread, and wear our own clothing: only let us be called by your name. Take away our reproach."

Yahweh will utterly destroy the tongue of the Egyptian sea; and with his scorching wind he will wave his hand over the River, and will split it into seven streams, and cause men to march over in sandals.

Moreover the light of the moon will be like the light of the sun, and the light of the sun will be seven times brighter, like the light of seven days, in the day that Yahweh binds up the fracture of his people, and heals the wound they were struck with.