7 Of the tribe of Simeon were sealed twelve thousand. Of the tribe of Levi were sealed twelve thousand. Of the tribe of Isachar were sealed twelve thousand.
Revelation 7:7 Cross References - Webster
Genesis 29:34
34 And she conceived again, and bore a son; and said, Now this time will my husband adhere to me, because I have borne him three sons: therefore was his name called Levi.
Genesis 30:18
18 And Leah said, God hath given me my hire, because I have given my maiden to my husband: and she called his name Issachar.
Genesis 35:23
23 The sons of Leah; Reuben, Jacob's first-born, and Simeon, and Levi, and Judah, and Issachar, and Zebulun:
Genesis 49:5
5 Simeon and Levi are brethren: instruments of cruelty are in, their habitations.
Genesis 49:11
11 Binding his foal to the vine, and his ass's colt to the choice vine; he washed his garments in wine, and his clothes in the blood of grapes:
Exodus 6:16
16 And these are the names of the sons of Levi, according to their generations; Gershon, and Kohath, and Merari. And the years of the life of Levi were a hundred and thirty-seven years.
Numbers 1:22
22 Of the children of Simeon, by their generations, after their families, by the house of their fathers, those that were numbered of them according to the number of the names, by their polls, every male from twenty years old and upward, all that were able to go forth to war;
Numbers 25:14
14 Now the name of the Israelite that was slain, even that was slain with the Midianitish woman, was Zimri, the son of Salu, a prince of a chief house among the Simeonites.
Numbers 26:14
14 These are the families of the Simeonites, twenty and two thousand and two hundred.
Judges 1:3
3 And Judah said to Simeon his brother, Come up with me into my lot, that we may fight against the Canaanites; and I likewise will go with thee into thy lot. So Simeon went with him.