'Seven' in the Bible

The time that David was king in Hebron over the house of Judah was seven years and six months.

At Hebron he reigned over Judah seven years and six months, and in Jerusalem he reigned thirty-three years over all Israel and Judah.

let seven men from his sons be given to us, and we will hang them before the Lord in Gibeah of Saul, the chosen of the Lord.” And the king said, “I will give them.”

Then he gave them into the hands of the Gibeonites, and they hanged them in the mountain before the Lord, so that the seven of them fell together; and they were put to death in the first days of harvest at the beginning of barley harvest.

So Gad came to David and told him, and said to him, “Shall seven years of famine come to you in your land? Or will you flee three months before your foes while they pursue you? Or shall there be three days’ pestilence in your land? Now consider and see what answer I shall return to Him who sent me.”