Esther 9:31

that these days of Purim should be observed at their appointed seasons, as Mordecai the Jew and Queen Esther obligated them, and as they had obligated themselves and their offspring, with regard to their fasts and their lamenting.

Esther 4:3

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

Esther 4:16

"Go, gather all the Jews to be found in Susa, and hold a fast on my behalf, and do not eat or drink for three days, night or day. I and my young women 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."

Jonah 3:2-9

"Arise, go to Nineveh, that great city, and call out against it the message that I tell you."

Treasury of Scripture Knowledge

Summary

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 fastings and their cry.

And for their seed

Esther 9:27

The fastings

Esther 4:3

Jonah 3:2

Bible References

And for their seed

the Jews firmly obligated themselves and their offspring and all who joined them, that without fail they would keep these two days according to what was written and at the time appointed every year,

The fastings

"Arise, go to Nineveh, that great city, and call out against it the message that I tell you."