'Wary' in the Bible

Make sure that you remain wary of God's sword, for God's wrath brings with it the sword of punishment, by which you'll know there's a judgment."

“Listen carefully: I am sending you out like sheep among wolves; so be wise as serpents, and innocent as doves [have no self-serving agenda].

Therefore we must be wary that, while the promise of entering his rest remains open, none of you may seem to have come short of it.