The Anchoress considers the intersection between Christianity and business courtesy, with reference to the US Bank lawsuit about “Have a blessed day.”
In medieval Ireland, it was an offense punished by a fine if any craftsman or -woman did not pray for a blessing from God for the completed work. The first person who saw the work was also expected to bless it.
(Possibly because it was then suspected that one might have cursed it. Or possibly because a lot of solemn Irish imprecatory cursing happened in the workplace, and one needed to offset that.)
Moving aside the point, it turns out that there’s another brehon law/mystery series out there besides Peter Tremayne’s early early medieval Sister Fidelma; this one is set in the 16th century in the twilight of the Gaelic law system. Mara, Brehon of the Burren stars in a series of over ten books. The first book, My Lady Judge, is $2.99 on the Kindle.