Mark 9:29

29AndκαὶHe saidεἶπενto themαὐτοῖς·ThisΤοῦτοτὸkindγένοςbyἐνnothingοὐδενὶis ableδύναταιto go outἐξελθεῖνifεἰnotμὴbyἐνprayerπροσευχῇ.

And He said to them, “This kind is able to come out by nothing except by prayer.”