'Seven' in the Bible

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

In 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 [chosen] from his sons (descendants) be given to us and we will hang them before the Lord [that is, put them on display, impaled with broken legs and arms] in Gibeah of Saul, the chosen one of the Lord.” And the king said, “I will give them.”

He handed them over to the Gibeonites, and they hanged them on the hill before the Lord, and the seven died together. They were put to death in the first days of the grain harvest, the beginning of the barley harvest [in the spring].

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 enemies as they pursue you? Or shall there be three days of pestilence (plague) in your land? Now consider this and decide what answer I shall return to Him who sent me.”