Kathasaritsagara 3.6.6

Then the king of Vatsa, while encamped in Lávánaka to rest his army, said in secret to Yaugandharáyana, " Through your sagacity I have conquered all the kings upon the earth, and they being won over by politic devices will not conspire against me. But this king of Benares, Brahmadatta, is an ill-conditioned fellow, and he alone, I think, will plot against me; what confidence can be reposed in the wicked-minded?" Then Yaugandharáyana, being spoken to in this strain by the king, answered, " O king, Brahmadatta will not plot against you again, for when he was conquered and submitted, you shewed him great consideration; and what sensible man will injure one who treats him well? Whoever does, will find that it turns out unfortunately for himself, and on this point, listen to what I am going to say; I will tell you a tale."

Then the king of Vatsa, while encamped in Lávánaka to rest his army, said in secret to Yaugandharáyana, " Through your sagacity I have conquered all the kings upon the earth, and they being won over by politic devices will not conspire against me. But this king of Benares, Brahmadatta, is an ill-conditioned fellow, and he alone, I think, will plot against me; what confidence can be reposed in the wicked-minded?" Then Yaugandharáyana, being spoken to in this strain by the king, answered, " O king, Brahmadatta will not plot against you again, for when he was conquered and submitted, you shewed him great consideration; and what sensible man will injure one who treats him well? Whoever does, will find that it turns out unfortunately for himself, and on this point, listen to what I am going to say; I will tell you a tale."