Why is a week seven days?

Genesis, which originated from the Bible, spent seven days commemorating God's creation of all things in the world.

The first day, day and night

The next day, the air

On the third day, flowers and plants and various fruit trees and vegetables grew on the ground.

The fourth day, the sun and the moon, and set the calendar.

On the fifth day, birds and beasts

On the sixth day, God created the images of men and women in his own image.

On the seventh day, God was tired and had a day off.

So I have the habit of having a rest on Sunday.