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' ×××).
The idea behind âyou reap what you sowâ is ancient and therefore has origins that are difficult to track, but one possible starting point is with early Christians. The phrase appears as âwhatsoever a man soweth, that he shall also reapâ in the King James Version of the New Testament.