עֶ֤רֶב וָבֹ֣קֶר וְ֭צָהֳרַיִם אָשִׂ֣יחָה וְאֶהֱמֶ֑ה וַיִּשְׁמַ֥ע קוֹלִֽי׃
Evening, and morning, and at noon, will I complain, and moan; And He hath heard my voice.
Rashi on Psalms
Evening, morning, and noontime The evening prayer, the morning prayer, and the afternoon prayer, three prayers.