“But thou, when thou prayest, enter into thy closet, and when thou hast shut thy door, pray to thy Father which is in secret; and thy Father which seeth in secret shall reward thee openly.”
King James Version (KJV)
6:6 Enter into thy closet - That is, do it with as much secrecy as thou canst.
Mt 6:6 When thou prayest, enter into thy closet. Private devotions are meant, nor is this designed to prohibit prayers in public assemblies. The Lord himself both prayed "in the mountain alone" (Mt 14:23), in the night alone (Lu 6:12), and in public in the presence of his disciples. We have records of many prayers offered by the apostles in public assemblies. "Thy closet" may mean any secret place. Peter's closet was on the house-top; the Savior's on a mountain alone.