'Seventh' in the Bible

On the seventh day, when the heart of the king was merry with wine, he commanded Mehuman, Biztha, Harbona, Bigtha, Abagtha, Zethar and Carkas, the seven eunuchs who served in the presence of King Ahasuerus,

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