2 Kings 4:39-40

39And one went out into the field to gather herbs, and found a wild vine, and gathered thereof wild gourds his lap full, and came and shred them into the pot of pottage: for they knew them not.

40So they poured out for the men to eat. And it came to pass, as they were eating of the pottage, that they cried out, and said, O man of God, there is death in the pot. And they could not eat thereof.