He said, “This is what the king who will reign over you will claim as his rights: He will take your sons and make them serve with his chariots and horses, and they will run in front of his chariots. 1 Samuel 8:11 NIV
If the slave that he caught run away from him, then shall he swear to the owners of the slave, and he is free of all blame.
If the slave will not give the name of the master, the finder shall bring him to the palace; a further investigation must follow, and the slave shall be returned to his master.