'Seven' in the Bible

The number of days that David was king over Hebron, over the house of Judah, [was] seven years and six months.

He reigned over Judah at Hebron [for] seven years and six months; and he reigned over all Israel and Judah at Jerusalem [for] thirty-three years.

David captured from him one thousand and seven hundred horsemen and twenty thousand {foot soldiers}. David hamstrung all the chariot horses, but {from them} he spared a hundred chariot horses.

And Aram fled before Israel, and David killed from [the] Arameans seven hundred chariot teams and forty thousand horsemen. He struck down Shobach, the commander of his army, and he died there.

let seven men from his sons be given over to us, and we will execute them before Yahweh in Gibeah of Saul, the chosen one of Yahweh." Then the king said, "I will give them over."

He gave them into the hands of the Gibeonites, and they executed them on the mountain in the presence of Yahweh, and the seven fell together. Now they were put to death in the days of the harvest, at the beginning of the harvest of barley.

Then Gad came to David, and he told him and said to him, "Shall seven years of famine in the land come to you? Or three months of your fleeing from your enemies while he [is] pursuing you? Or should there be three days of pestilence in your land? Now consider and decide what I must return to the one who sent me a word."