New Revised Standard Version
They will suck the poison of asps; the tongue of a viper will kill them.

Contemporary English Version
They will die from the fangs of poisonous snakes

New American Bible
The poison of asps he shall drink in; the viper’s fangs shall slay him.

Douay-Rheims Bible
He shall suck the head of asps, and the viper's tongue shall kill him.

He shall suck the head of asps, and the viper's tongue shall kill him.

the poison

Romans 3:13 Their throat is an open sepulchre: with their tongues they have dealt deceitfully. The venom of asps is under their lips.

the viper's

Isaiah 30:6 The burden of the beasts of the south. In a land of trouble and distress, from whence come the lioness, and the lion, the viper and the flying basilisk, they carry their riches upon the shoulders of beasts, and their treasures upon the bunches of camels to a people that shall not be able to profit them.

Matthew 3:7 And seeing many of the Pharisees and Sadducees coming to his baptism, he said to them: Ye brood of vipers, who hath shewed you to flee from the wrath to come?

Acts 28:3-6 And when Paul had gathered together a bundle of sticks and had laid them on the fire, a viper, coming out of the heat, fastened on his hand. . . .