The Merciful Lie Before the King
A condemned prisoner curses the king in a language the king does not understand, and a kind vizier translates it as a Qur'anic verse praising those who restrain anger and forgive, so the king spares him. A rival vizier exposes the real meaning, but the king rules that the first vizier's lie, told to prevent harm, pleased him more than the second's truth, told out of malice. This is the source of Saadi's maxim that a well-meaning lie is better than a truth that stirs up trouble.