Kings: when First Established in Israel, not Hereditary
Source: TTT
Deuteronomy 17:20
Then his heart will not be exalted above his countrymen, and he will not turn aside from the commandment, to the right or to the left, in order that he and his sons may reign many years over his kingdom in Israel.
1 Samuel 13:13, 14
“You have acted foolishly,” Samuel declared. “You have not kept the command that the LORD your God gave you; if you had, the LORD would have established your kingdom over Israel for all time. / But now your kingdom will not endure; the LORD has sought a man after His own heart and appointed him ruler over His people, because you have not kept the command of the LORD.”
1 Samuel 15:28, 29
So Samuel said to him, “The LORD has torn the kingdom of Israel from you today and has given it to your neighbor who is better than you. / Moreover, the Glory of Israel does not lie or change His mind, for He is not a man, that He should change His mind.”