The Bodhisatta was once Treasurer of Bārāṇasī, and some rogues, wishing to rob him of his money, conspired together and drugged some liquor, which they offered him as he was on his way to the palace. The Treasurer suspected them, and promised to join them on his way back from the palace. However, on his return the vessels that contained the liquor were still quite full; he therefore charged the men with the intent to poison him, or they would have drunk some of the liquor during his absence. They then ran away.
The story was told to Anāthapiṇḍika, who had a similar experience. However, in this case he was returning from the palace, and challenged the rogue’s to taste their own liquor first. J.i.268 ﬀ.