Find accurate definitions of over 5,000 Catholic terms and phrases (including abbreviations). Based on Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.
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The invocation "Holy God, Holy and Mighty, Holy and Immortal, have mercy on us," which occurs in all the liturgies of the East at some point between the readings. In the Latin Rite it is sung on Good Friday as one of the reproaches during the veneration of the Cross. It also occurs in the Divine Office during penitential seasons.