Bible Encyclopedias
Nineteenth Day of the Month.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

In the morning service of the Church of England and the Protestant Episcopal churches it is directed that on the nineteenth day of any month the Venite Exultemus (or Psalm beginning, "O come, let us sing unto the Lord") shall not be said or sung. The reason is that it occurs on that day in the regular portion of Psalms, and would thus occasion an unnecessary repetition.

Bibliography Information
McClintock, John. Strong, James. Entry for 'Nineteenth Day of the Month.'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/​encyclopedias/​eng/​tce/​n/nineteenth-day-of-the-month.html. Harper & Brothers. New York. 1870.