Colossians 2:8. Be careful that you don’t let anyone rob you through his philosophy and vain deceit, after the tradition of men, after the elements of the world, and not after Christ.
Galatians 5:14-16. The whole law is fulfilled in one word, in this: “You shall love your neighbor as yourself.” But if you bite and devour one another, be careful that you don’t consume one another. But I say, walk by the Spirit, and you won’t fulfill the lust of the flesh.
Luke 21:33-36. “Heaven and earth will pass away, but my words will by no means pass away. So be careful, or your hearts will be loaded down with carousing, drunkenness, and cares of this life, and that day will come on you suddenly. For it will come like a snare on all those who dwell on the surface of all the earth. Therefore be watchful all the time, praying that you may be counted worthy to escape all these things that will happen, and to stand before the Son of Man.”