Τὸν δὲ ἀσθενοῦντα τῇ πίστει προσλαμβάνεσθε, μὴ εἰς διακρίσεις διαλογισμῶν. ὃς μὲν πιστεύει φαγεῖν πάντα, ὁ δὲ ἀσθενῶν λάχανα ἐσθίει. ὁ ἐσθίων τὸν μὴ ἐσθίοντα μὴ ἐξουθενείτω, ὁ δὲ μὴ ἐσθίων τὸν ἐσθίοντα μὴ κρινέτω, ὁ θεὸς γὰρ αὐτὸν προσελάβετο. σὺ τίς εἶ ὁ κρίνων ἀλλότριον οἰκέτην; τῷ ἰδίῳ κυρίῳ στήκει ἢ πίπτει· σταθήσεται δέ, δυνατεῖ γὰρ ὁ κύριος στῆσαι αὐτόν. Ὃς μὲν [γὰρ] κρίνει ἡμέραν παρʼ ἡμέραν, ὃς δὲ κρίνει πᾶσαν ἡμέραν· ἕκαστος ἐν τῷ ἰδίῳ νοῒ πληροφορείσθω. ὁ φρονῶν τὴν ἡμέραν κυρίῳ φρονεῖ · καὶ ὁ ἐσθίων κυρίῳ ἐσθίει, εὐχαριστεῖ γὰρ τῷ θεῷ· καὶ ὁ μὴ ἐσθίων κυρίῳ οὐκ ἐσθίει καὶ εὐχαριστεῖ τῷ θεῷ. οὐδεὶς γὰρ ἡμῶν ἑαυτῷ ζῇ καὶ οὐδεὶς ἑαυτῷ ἀποθνῄσκει· ἐάν τε γὰρ ζῶμεν, τῷ κυρίῳ ζῶμεν, ἐάν τε ἀποθνῄσκωμεν, τῷ κυρίῳ ἀποθνῄσκομεν. ἐάν τε οὖν ζῶμεν ἐάν τε ἀποθνῄσκωμεν, τοῦ κυρίου ἐσμέν. εἰς τοῦτο γὰρ Χριστὸς ἀπέθανεν καὶ ἔζησεν, ἵνα καὶ νεκρῶν καὶ ζώντων κυριεύσῃ. Σὺ δὲ τί κρίνεις τὸν ἀδελφόν σου; ἢ καὶ σὺ τί ἐξουθενεῖς τὸν ἀδελφόν σου; πάντες γὰρ παραστησόμεθα τῷ βήματι τοῦ θεοῦ, γέγραπται γάρ· ζῶ ἐγώ, λέγει κύριος, ὅτι ἐμοὶ κάμψει πᾶν γόνυ καὶ πᾶσα γλῶσσα ἐξομολογήσεται τῷ θεῷ. ἄρα [οὖν] ἕκαστος ἡμῶν περὶ ἑαυτοῦ λόγον δώσει [τῷ θεῷ]. Μηκέτι οὖν ἀλλήλους κρίνωμεν· ἀλλὰ τοῦτο κρίνατε μᾶλλον, τὸ μὴ τιθέναι πρόσκομμα τῷ ἀδελφῷ ἢ σκάνδαλον. Romans 14:1–13, NA28
Now accept the one who is weak in faith, but not for the purpose of passing judgment on his opinions. One person has faith that he may eat all things, but he who is weak eats vegetables only. The one who eats is not to regard with contempt the one who does not eat, and the one who does not eat is not to judge the one who eats, for God has accepted him. Who are you to judge the servant of another? To his own master he stands or falls; and he will stand, for the Lord is able to make him stand. One person regards one day above another, another regards every day alike. Each person must be fully convinced in his own mind. He who observes the day, observes it for the Lord, and he who eats, does so for the Lord, for he gives thanks to God; and he who eats not, for the Lord he does not eat, and gives thanks to God. For not one of us lives for himself, and not one dies for himself; for if we live, we live for the Lord, or if we die, we die for the Lord; therefore whether we live or die, we are the Lord’s. For to this end Christ died and lived again, that He might be Lord both of the dead and of the living. But you, why do you judge your brother? Or you again, why do you regard your brother with contempt? For we will all stand before the judgment seat of God. For it is written, “As I live, says the Lord, every knee shall bow to me, And every tongue shall give praise to God.” So then each one of us will give an account of himself to God. Therefore let us not judge one another anymore, but rather determine this— not to put an obstacle or a stumbling block in a brother’s way. Romans 14:1–13, NASB
When I encounter a believer who is legalistic, no matter how well versed they are on the Biblical passages they specialize in, I know I am dealing with someone who is spiritually immature. The more mature we become in Christ the more Christlike we become and that means we do not pass judgment on those who do not understand the Law of Liberty.