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' ×××).
That is what King David does in the two psalms at the close of 2 Samuel. Second Samuel 22 records David's reflections, penned at the outset of his reign as Israel's king. The first seven verses of chapter 23 are a second psalm; this one is perhaps David's last psalm.1) The messenger seems eager to make this journey to find David and tell him of the death of Saul and Jonathan. Like Ahimaaz in 2 Samuel 18:19-23, he seems to want to bring David the news because he expects David to be pleased with what he hears (see 2 Samuel 4:9-10).