'Guardians' in the Bible

Since Ahab had 70 sons in Samaria, Jehu wrote letters and sent them to Samaria to the rulers of Jezreel, to the elders, and to the guardians of Ahab’s sons, saying:

So the overseer of the palace, the overseer of the city, the elders, and the guardians sent a message to Jehu: “We are your servants, and we will do whatever you tell us. We will not make anyone king. Do whatever you think is right.”

Shallum son of Kore, son of Ebiasaph, son of Korah and his relatives from his ancestral household, the Korahites, were assigned to guard the thresholds of the tent. Their ancestors had been assigned to the Lord’s camp as guardians of the entrance.

on the day when the guardians of the house tremble,and the strong men stoop,the women who grind cease because they are few,and the ones who watch through the windows see dimly,

The guards who go about the city found me.They beat and wounded me;they took my cloak from me—the guardians of the walls.

Instead, he is under guardians and stewards until the time set by his father.