Ezra
1 Chronicles 12:33ESV·traditional attribution

Of Zebulun 50,000 seasoned troops, equipped for battle with all the weapons of war, to help David with singleness of purpose.

Matthew Henry Presbyterian @wholebiblehenry

We have here an account of those who were active in perfecting the settlement of David upon the throne, after the death of Ishbosheth. We read (Ch1 11:1, and before Sa2 5:1) that all the tribes of Israel came, either themselves or by their representatives, to Hebron, to make David king; now here we have an account of the quota which every tribe brought in...

Commenting on 1 Chronicles 12:23-40

Jamieson-Fausset-Brown Reformed @jfbcommentary

THE ARMIES THAT CAME TO HIM AT HEBRON. (1Ch. 12:23-40) these are the numbers of the bands . . . that came to David to Hebron--after the death of Ish-bosheth (see on Sa2 5:1). to turn the kingdom of Saul to him, according to the word of the Lord-- (Ch1 10:14; Ch1 11:3, Ch1 11:10).

Commenting on 1 Chronicles 12:23-40

Jamieson-Fausset-Brown Reformed @jfbcommentary

Zebulun . . . could keep rank--that is, were more disciplined soldiers than the rest. not of double heart--Though their numbers were large, all were in a high degree well affected to David.