Esther 9:31

To confirm these days of Purim in their times [appointed], according as Mordecai the Jew and Esther the queen had enjoined them, and as they had decreed for themselves and for their seed, the matters of the (s) fastings and their cry.

(s) That they would observe this feast with fasting and earnest prayer, which in Hebrew is signified by this word (they cry).