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. It also constitutes the bulk of the first movement of Leonard Bernstein 's Chichester Psalms.