Matthew 14:26

14:26 When the disciples saw him walking on the water they were terrified and said, “It’s a ghost!” and cried out with fear.

Matthew 17:15

17:15 and said, “Lord, have mercy on my son, because he has seizures and suffers terribly, for he often falls into the fire and into the water.

tn Here δέ (de) has not been translated.

tn Grk “on the sea”; or “on the lake.” The translation “water” has been used here for stylistic reasons (cf. the same phrase in v. 25).

tn Grk “he is moonstruck,” possibly meaning “lunatic” (so NAB, NASB), although now the term is generally regarded as referring to some sort of seizure disorder such as epilepsy (L&N 23.169; BDAG 919 s.v. σεληνιάζομαι).