Kings III 12:21

21 And Roboam went into Jerusalem, and he assembled the congregation of Juda, and the tribe of Benjamin, a hundred and twenty thousand young men, warriors, to fight against the house of Israel, to recover the kingdom to Roboam the son of Solomon.

Kings III 12:21 In-Context

19 So Israel rebelled against the house of David until this day.
20 And it came to pass when all Israel heard that Jeroboam had returned out of Egypt, that they sent and called him to the assembly, and they made him king over Israel: and none followed the house of David except the tribe of Juda and Benjamin only.
21 And Roboam went into Jerusalem, and he assembled the congregation of Juda, and the tribe of Benjamin, a hundred and twenty thousand young men, warriors, to fight against the house of Israel, to recover the kingdom to Roboam the son of Solomon.
22 And the word of the Lord came to Samaia the man of God, saying,
23 Speak to Roboam the son of Solomon, king of Juda, and to all the house of Juda and Benjamin, and to the remnant of the people, saying,

Footnotes 1

The Brenton translation of the Septuagint is in the public domain.