Matt.7.16  You will know them by their fruits. Are grapes gathered from thorns, or figs from thistles?
Heb.6.8  But if it bears thorns and thistles, it is worthless and near to being cursed; its end is to be burned.

Hyper-concordance v1.1, by Sean Boisen. Scripture verses taken from the Revised Standard Version, copyright 1952, 1971.