27 the Jews bound themselves to establish the custom that they and their descendants and all who join them should not fail to celebrate these two days at the appointed time each and every year, according to their regulation.
Esther 9:27 Cross References - MSB
Deuteronomy 5:3
3 He did not make this covenant with our fathers, but with all of us who are alive here today.
Deuteronomy 29:14-15
Joshua 9:15
15 And Joshua made a treaty of peace with them to let them live, and the leaders of the congregation swore an oath to them.
1 Samuel 30:25
25 And so it has been from that day forward. David established this statute as an ordinance for Israel to this very day.
2 Samuel 21:1-2
1 During the reign of David there was a famine for three successive years, and David sought the face of the LORD. And the LORD said, “It is because of the blood shed by Saul and his family, because he killed the Gibeonites.”
2 At this, David summoned the Gibeonites and spoke to them. (Now the Gibeonites were not Israelites, but a remnant of the Amorites. The Israelites had taken an oath concerning them, but in his zeal for Israel and Judah, Saul had sought to kill them.)
Esther 8:17
17 In every province and every city, wherever the king’s edict and decree reached, there was joy and gladness among the Jews, with feasting and celebrating. And many of the people of the land themselves became Jews, because the fear of the Jews had fallen upon them.
Esther 9:21
21 to establish among them an annual celebration on the fourteenth and fifteenth days of the month of Adar
Isaiah 56:3
3 Let no foreigner who has joined himself to the LORD say, “The LORD will utterly exclude me from His people.” And let the eunuch not say, “I am but a dry tree.”
Isaiah 56:6
6 And the foreigners who join themselves to the LORD to minister to Him, to love the name of the LORD, and to be His servants—all who keep the Sabbath without profaning it and who hold fast to My covenant—
Zechariah 2:11
11 “On that day many nations will join themselves to the LORD, and they will become My people. I will dwell among you, and you will know that the LORD of Hosts has sent Me to you.
Zechariah 8:23
23 This is what the LORD of Hosts says: “In those days ten men from the nations of every tongue will tightly grasp the robe of a Jew, saying, ‘Let us go with you, for we have heard that God is with you.’”