'Poisonous' in the Bible

“I wounded you with blight [from the hot, blasting east wind] and with mildew;And the caterpillar devouredYour many gardens and vineyards, your fig trees and your olive trees;Yet you have not returned to Me [in repentance],” says the Lord.

Disaster will be inescapable, as if a man ran from a lion only to meet a bear, then escaped into a house, leaned his hand against the wall, and was bitten by a poisonous snake.

Can horses run on rocky cliffs? Can one plow the sea with oxen? Yet you have turned justice into a poisonous plant, and the fruit of righteous actions into a bitter plant.