the poison

Romans 3:13
Their throats are open graves; their tongues practice deceit. The venom of vipers is on their lips.

the viper's

Isaiah 30:6
This is an oracle concerning the animals of the Negev: Through a land of hardship and distress, of lioness and lion, of viper and flying serpent, they carry their wealth on the backs of donkeys and their treasures on the humps of camels, to a people of no profit to them.

Matthew 3:7
But when John saw many of the Pharisees and Sadducees coming to his place of baptism, he said to them, "You brood of vipers, who warned you to flee from the coming wrath?

Acts 28:3-6
Paul gathered a bundle of sticks, and as he laid them on the fire, a viper, driven out by the heat, fastened itself to his hand. . . .