Prayer was a religious ceremony.

The Invocation of Renewal was a prayer Borothan pilgrims recited during the Great Plume of Agosoria. Doctor Phlox also participated in four hours of prayer while on a visit to the pilgrim's ship. (ENT: "Cold Front")

In 2371, Kira Nerys said a prayer for Vedek Bareil Antos, who had died earlier in the year. (DS9: "Shakaar")

In 2373, Tuvok offered Lon Suder a Vulcan prayer over his corpse after Suder had been killed by the Kazon-Nistrim. It went: "May your death bring you the peace you never found in life." (VOY: "Basics, Part II")

In 2376, Harry Kim suggested that he and Lyndsay Ballard altered Tuvok's Temple of T'Panit holoprogram so that the monks recited Ferengi limericks instead of Vulcan prayers. (VOY: "Ashes to Ashes")

In 2377, Kohlar recited a Klingon prayer called the Plea for the Dead. {VOY: "Prophecy")