'Seventh' in the Bible

On the seventh day, when the heart of the king was glad with wine, he gave orders to Mehuman, Biztha, Harbona, Bigtha, and Abagtha, Zethar, and Carcas, the seven unsexed servants who were waiting before Ahasuerus the king,

So Esther was taken in to King Ahasuerus in his house in the tenth month, which is the month Tebeth, in the seventh year of his rule.