'Establish' in the Bible

to establish on them, to be keeping the fourteenth day of the month of Adar, and the fifteenth day of it, in every year and year,

And Esther the queen, daughter of Abihail, writeth, and Mordecai the Jew, with all might, to establish this second letter of Purim,

to establish these days of Purim, in their seasons, as Mordecai the Jew hath established on them, and Esther the queen, and as they had established on themselves, and on their seed -- matters of the fastings, and of their cry.