33 from Zebulun, experienced soldiers prepared for battle with every type of weapon, to help David with undivided loyalty—50,000;

Read 1 Chronicles 12:33 Using Other Translations

Of Zebulun, such as went forth to battle, expert in war, with all instruments of war, fifty thousand, which could keep rank: they were not of double heart.
Of Zebulun 50,000 seasoned troops, equipped for battle with all the weapons of war, to help David with singleness of purpose.
From the tribe of Zebulun, there were 50,000 skilled warriors. They were fully armed and prepared for battle and completely loyal to David.