'Seven' in the Bible

For see, the stone which I have put before Joshua; on one stone are seven eyes: see, the design cut on it will be my work, says the Lord of armies, and I will take away the sin of that land in one day.

And he said to me, What do you see? And I said, I see a light-support, made all of gold, with its cup on the top of it and seven lights on it; and there are seven pipes to every one of the lights which are on the top of it;

For who has had a poor opinion of the day of small things? for they will be glad when they see the weighted measuring-line in the hand of Zerubbabel. Then he said in answer to me, These seven lights are the eyes of the Lord which go quickly up and down through all the earth.