'Poisonous' in the Bible

We must not tempt the Lord [that is, test His patience, question His purpose or exploit His goodness], as some of them did—and they were killed by serpents.

And never again will the light of a lamp shine in you, and never again will the voice of the bridegroom and bride be heard in you; for your merchants were the great and prominent men of the earth, because all the nations were deceived and misled by your sorcery [your magic spells and poisonous charm].