In Matthew 7:16-27 we find Jesus warning his hearers about False Prophets, but the warnings are applicable to everyone who professes faith in Jesus for salvation.

"You will know them by their fruits. Grapes are not gathered from thorn bushes nor figs from thistles, are they? 17 "So every good tree bears good fruit, but the bad tree bears bad fruit. 18 "A good tree cannot produce bad fruit, nor can a bad tree produce good fruit. (there is a fundamental difference between the two) 19 "Every tree that does not bear good fruit is cut down and thrown into the fire. 20 "So then, you will know them by their fruits. 21"Not everyone who says to Me, ‘Lord, Lord,’ will enter the kingdom of heaven, but he who does the will of My Father who is in heaven will enter. 22 "Many will say to Me on that day, ‘Lord, Lord, did we not prophesy in Your name, and in Your name cast out demons, and in Your name perform many miracles?’ 23 "And then I will declare to them, ‘I never knew you; DEPART FROM ME, YOU WHO PRACTICE LAWLESSNESS.’ (The lawless person’s only rule of faith and practice is what he wants at any given moment. The Christian’s only rule of faith must be the Word of God; that is the standard by which he lives and breathes.) 24 "Therefore everyone (every person on earth) who hears these words of Mine and acts on them, (obeys them) may be compared to a wise man who built his house on the rock. 25 "And the rain fell, and the floods came, and the winds blew and slammed against that house; (he speaks of the storms of life, temptations from within and without, tests, trials, suffering physically and spiritually, the onslaughts of Satan) and yet it did not fall, for it had been founded on the rock. (That Rock is Jesus Christ, the God man, who died to save sinners FROM their sin. On the other hand, . . .) 26 "Everyone who hears these words of Mine and does not act on them, will be like a foolish man who built his house on the sand. 27 "The rain fell, and the floods came, and the winds blew and slammed against that house; and it fell — and great was its fall." Therefore, professed faith in Christ that does not produce love for God, man, and obedience to the Word, is not saving faith.