Jashobeam son of Zabdiel was in charge of the first division, which was assigned the first month. There were 24,000 men in his division.

2 Samuel 23:8
These are the names of David's mighty men: Josheb-basshebeth the Tahchemonite was chief of the Three. He wielded his spear against eight hundred men, whom he killed at one time.

1 Chronicles 11:11
This is the list of David's mighty men: Jashobeam son of Hachmoni was chief of the officers; he wielded his spear against three hundred men, whom he killed at one time.

1 Chronicles 27:1
This is the list of the Israelites--the heads of families, the commanders of thousands and of hundreds, and their officers who served the king in every matter concerning the divisions on rotating military duty each month throughout the year. There were 24,000 men in each division:

1 Chronicles 27:3
He was a descendant of Perez and chief of all the army commanders for the first month.

Over the first course for the first month was Jashobeam the son of Zabdiel: and in his course were twenty and four thousand.