A.T. Robertson Commentary Matthew 14:25

"And in the fourth watch of the night he came unto them, walking upon the sea." — Matthew 14:25 (ASV)

Walking upon the sea (περιπατων επ την θαλασσαν). Another nature miracle. Some scholars actually explain it all away by urging that Jesus was only walking along the beach and not on the water, an impossible theory unless Matthew's account is legendary. Matthew uses the accusative (extension) with επ in verse 25 and the genitive (specifying case) in 26.