The infant will play by the cobra's den, and the toddler will reach into the viper's nest.

Proverbs 23:32
In the end it bites like a snake and stings like a viper.

Isaiah 11:7
The cow will graze with the bear, their young will lie down together, and the lion will eat straw like the ox.

Isaiah 11:9
They will neither harm nor destroy on all My holy mountain, for the earth will be full of the knowledge of the LORD as the sea is full of water.

Isaiah 14:29
Do not rejoice, all you Philistines, that the rod that struck you is broken. For a viper will spring from the root of the snake, and a flying serpent from its egg.

And the sucking child shall play on the hole of the asp, and the weaned child shall put his hand on the cockatrice' den.