Esther 9:31

Christian Standard Bible Anglicised

in order to confirm these days of Purim at their proper time just as Mordecai the Jew and Esther the queen had established them and just as they had committed themselves and their descendants to the practices of fasting  and lamentation.

Cross References

Esther 4:3

There was great mourning among the Jewish people in every province where the king’s command and edict  reached. They fasted, wept, and lamented, and many lay in sackcloth and ashes.

Esther 4:16

‘Go and assemble all the Jews who can be found in Susa and fast for me. Don’t eat or drink for three days,  night or day. I and my female servants will also fast  in the same way. After that, I will go to the king even if it is against the law.  If I perish, I perish.’

2 Chronicles 35:25

Jeremiah chanted a dirge  over Josiah, and all the male and female singers still speak of Josiah in their dirges today. They established them as a statute for Israel, and indeed they are written in the Dirges.