Matthew 6:6

σὺ δὲ ὅταν προσεύχῃ εἴσελθε εἰς τὸ ταμεῖόν σου καὶ κλείσας τὴν θύραν πρόσευξαι τῷ Πατρί ἐν κρυπτῷ ὁ Πατήρ βλέπων ἀποδώσει σοι

sy de hotan proseuchē eiselthe eis to tameion sou kai kleisas tēn thyran proseuxai tō Patri en kryptō ho Patēr blepōn apodōsei soi

yourself however when you pray enter for the room of You And having shut the door pray - Father in secret - Father looking upon will reward to You