chained_bear commented on the word mackerel-snapper I get the fish-eater thing, but I don't know why non-Catholics wouldn't want mackerel--evidenced by the use of the term in a disparaging phrase. (Or wouldn't want snapper, for that matter.)
Psalm 1 is the first of the Psalms in the Hebrew Bible. Like many of the psalms, it contrasts the  righteous  person (tzadik ×¦×××§) to the wicked or ungodly (rasha` ×¨×©×¢) or the  sinner  (chatta' ×××).
Psalm 100 (Greek numbering: Psalm 99) is part of the biblical Book of Psalms. It may be used as a canticle in the Anglican liturgy of Morning Prayer, when it is referred to by its incipit as the Jubilate or Jubilate Deo.