Esther 9:31

Revised Standard Version (RSV-CI)

that these days of Purim should be observed at their appointed seasons, as Mordecai the Jew and Queen Esther enjoined upon the Jews, and as they had laid down for themselves and for their descendants, with regard to their fasts and their lamenting.

Cross References

2 Chronicles 35:25

Jeremiah also uttered a lament for Josiah; and all the singing men and singing women have spoken of Josiah in their laments to this day. They made these an ordinance in Israel; behold, they are written in the Laments.

Esther 4:16

“Go, gather all the Jews to be found in Susa, and hold a fast on my behalf, and neither eat nor drink for three days, night or day. I and my maids will also fast as you do. Then I will go to the king, though it is against the law; and if I perish, I perish.”

Esther 4:3

And in every province, wherever the king's command and his decree came, there was great mourning among the Jews, with fasting and weeping and lamenting, and most of them lay in sackcloth and ashes.