4 ideas
Ahiqar, the childless chancellor of Sennacherib, adopts and trains his nephew Nadin and gets him installed as his successor at court. Nadin then accuses him of treason before King Esarhaddon, who orders Ahiqar's execution. The officer Nabusumiskun, whose life Ahiqar had once saved, kills a substitute and hides Ahiqar, who survives to be restored in later versions of the tale.
Ahiqar gives Nadin his office, his access to the king, and his training. What he cannot pass on is loyalty or restraint. Once the heir holds the mentor's position, the mentor becomes the one obstacle to his full control, so the betrayal follows from the handover itself.
Ahiqar survives only because the executioner sent for him is a man he once spared from death. The debt of that earlier act comes due at the exact moment the formal system has condemned him. A favor granted when you hold power can become the only protection left when you lose it.
The proverbs treat a word as something that cannot be taken back once it leaves the mouth: it is like a bird, and releasing it cannot be undone. A king's word is described as sharper than a double-edged knife and burning like a flame. Seen this way, prudence is guarding the mouth before speaking, because at court speech carries lethal force.