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This is the origin of the Jews feast of Purim. Certainly, it was important to them that they celebrate their deliverance and victory over their enemies. It was a day of gladness and joy to memorialize that very special day with great thanksgiving. They also sent portions to one another thus sharing their blessings with others.
Est. 9:18-19 While it was not one of the feasts appointed by the Lord we still find significance in it. The Lord has promised a last day mighty outpouring of His Spirit which will be a time of great spiritual victory and joy in the Spirit. Joel 2:27.
The feast followed the pattern established by the main feast of Israel. The full moon was the time when it was customarily to take place. The moon is a type of Christ in its waxing and waning. It speaks of the death burial and resurrection of Christ every month in its journey from light to darkness and then back to fullness of light. The moon is noted as being the faithful witness in the sky. Ps.89:37 Jesus is specifically called the faithful witness.
Rev. 1:5 Before, (please note that is before He returns), the return of the Lord Jesus the full witness of His atoning work will be displayed as the moon is turned into blood. Joel wrote of this taking place. Joel 3:15 Jesus mentioned it. Mt. 24:29 Peter preached about it stating that before His coming the moon would be turned into blood. Acts 2:20 John on Patmos saw it take place in a vision. Rev. 6:12.
There are four things which mark the day and for which they celebrated. They had rest from their enemies. It was a matter of the Lord manifesting His mercy as expressed in the words of Isaiah. They found relief from suffering, turmoil and bondage. Isa. 14:1 They were clothed with joy. Ps. 30:11 Their day of mourning turned in into and excellent day. Their days were now days of feasting and rejoicing for the Lord had given them a great victory over their foes. Est. 9:22.