Gradual with text from Psalm 23. In the tridentine Requiem mass of the late 16c it is replaced by Requiem aeternam with the verse In memoria aeternam, while the 1990 Gregorian Missal lists it among 4 other options.
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Text and translations
| Latin text
Si ámbulem in médio umbrae mortis,
| English translation
If I walk in the midst of the shadow of death,