'Seven' in the Bible

“She who bore seven sons pines away;Her breathing is labored.Her sun has set while it was yet day;She has been shamed and humiliated.So I will give over their survivors to the swordBefore their enemies,” declares the Lord.

“At the end of seven years each of you shall set free his Hebrew brother who has been sold to you and has served you six years, you shall send him out free from you; but your forefathers did not obey Me or incline their ear to Me.

He also took from the city one official who was overseer of the men of war, and seven of the king’s advisers who were found in the city, and the scribe of the commander of the army who mustered the people of the land, and sixty men of the people of the land who were found in the midst of the city.