Mt 17:15-21 (King James)

¹⁵ Lord, have mercy on my son: for he is lunatick, and sore vexed: for ofttimes he falleth into the fire, and oft into the water.
¹⁶ And I brought him to thy disciples, and they could not cure him.
¹⁷ Then Jesus answered and said, O faithless and perverse generation, how long shall I be with you? how long shall I suffer you? bring him hither to me.
¹⁸ And Jesus rebuked the devil; and he departed out of him: and the child was cured from that very hour.
¹⁹ Then came the disciples to Jesus apart, and said, Why could not we cast him out?
²⁰ And Jesus said unto them, Because of your unbelief: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you.
²¹ Howbeit this kind goeth not out but by prayer and fasting.

Mt 17:15-21 (Stephanus 1550)

¹⁵ κύριε ἐλέησόν μου τὸν υἱόν ὅτι σεληνιάζεται καὶ κακῶς πάσχει πολλάκις γὰρ πίπτει εἰς τὸ πῦρ καὶ πολλάκις εἰς τὸ ὕδωρ
¹⁶ καὶ προσήνεγκα αὐτὸν τοῖς μαθηταῖς σου καὶ οὐκ ἠδυνήθησαν αὐτὸν θεραπεῦσαι
¹⁷ ἀποκριθεὶς δὲ ὁ ἰησοῦς εἶπεν ὦ γενεὰ ἄπιστος καὶ διεστραμμένη ἕως πότε ἔσομαι μεθ᾽ ὑμῶν ἕως πότε ἀνέξομαι ὑμῶν φέρετέ μοι αὐτὸν ὧδε
¹⁸ καὶ ἐπετίμησεν αὐτῷ ὁ ἰησοῦς καὶ ἐξῆλθεν ἀπ᾽ αὐτοῦ τὸ δαιμόνιον καὶ ἐθεραπεύθη ὁ παῖς ἀπὸ τῆς ὥρας ἐκείνης
¹⁹ τότε προσελθόντες οἱ μαθηταὶ τῷ ἰησοῦ κατ᾽ ἰδίαν εἶπον διατί ἡμεῖς οὐκ ἠδυνήθημεν ἐκβαλεῖν αὐτό
²⁰ ὁ δὲ ἰησοῦς εἶπεν αὐτοῖς διὰ τὴν ἀπιστίαν ὑμῶν ἀμὴν γὰρ λέγω ὑμῖν ἐὰν ἔχητε πίστιν ὡς κόκκον σινάπεως ἐρεῖτε τῷ ὄρει τούτῳ μετάβηθι ἔντεῦθεν ἐκεῖ καὶ μεταβήσεται καὶ οὐδὲν ἀδυνατήσει ὑμῖν
²¹ τοῦτο δὲ τὸ γένος οὐκ ἐκπορεύεται εἰ μὴ ἐν προσευχῇ καὶ νηστείᾳ