Some of the tribe of Manasseh defected to David when he went with the Philistines to fight against Saul. (He and his men did not help the Philistines because, after consultation, their rulers sent him away. They said, “It will cost us our heads if he deserts to his master Saul.”)
References for 1 Chronicles 12:19
When David went to Ziklag, these were the men of Manasseh who defected to him: Adnah, Jozabad, Jediael, Michael, Jozabad, Elihu and Zillethai, leaders of units of a thousand in Manasseh.
References for 1 Chronicles 12:20
They helped David against raiding bands, for all of them were brave warriors, and they were commanders in his army.
Day after day men came to help David, until he had a great army, like the army of God.
References for 1 Chronicles 12:22
These are the numbers of the men armed for battle who came to David at Hebron to turn Saul’s kingdom over to him, as the LORD had said:
References for 1 Chronicles 12:23
from Judah, carrying shield and spear—6,800 armed for battle;
from Simeon, warriors ready for battle—7,100;
including Jehoiada, leader of the family of Aaron, with 3,700 men,
and Zadok, a brave young warrior, with 22 officers from his family;
References for 1 Chronicles 12:28
from Benjamin, Saul’s tribe—3,000, most of whom had remained loyal to Saul’s house until then;
References for 1 Chronicles 12:29