Esther 9:31

in order to confirm these days of Purim in their set times, according as Mordecai the Jew and Esther the queen had ordered them, and as they had decreed for themselves and for their seed the matters of the fastings and of their cry.

Esther 4:3

And in every province, wherever the king's command and his decree came, there was great mourning among the Jews, and fasting, and weeping and wailing. And many lay in sackcloth and ashes.

Esther 4:16

Go, gather all the Jews who are present in Shushan, and fast for me, and do not eat nor drink three days, night or day. My maidservants and I will also fast in the same way. And so I will go in to the king, which is not according to the law. And if I perish, I perish.

Jonah 3:2-9

Arise, go to Nineveh, that great city, and cry out to it the proclamation that I am declaring to you.

Treasury of Scripture Knowledge

Summary

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 fastings and their cry.

And for their seed

The fastings

Bible References

And for their seed

Esther 9:27
the Jews ordained, and took on them and on their seed, and on all such as joined themselves to them, so as it should not fail, that they would keep these two days according to their writing, and according to their time every year,

The fastings

Esther 4:3
And in every province, wherever the king's command and his decree came, there was great mourning among the Jews, and fasting, and weeping and wailing. And many lay in sackcloth and ashes.
Jonah 3:2
Arise, go to Nineveh, that great city, and cry out to it the proclamation that I am declaring to you.