'Poison' in the Bible

And the child at the breast will be playing by the hole of the snake, and the older child will put his hand on the bright eye of the poison-snake.

Be not glad, O Philistia, all of you, because the rod which was on you is broken: for out of the snake's root will come a poison-snake, and its fruit will be a winged poison-snake.

They give birth to snake's eggs, and make spider's threads: whoever takes their eggs for food comes to his death, and the egg which is crushed becomes a poison-snake.