*I knew I’d notice an error only once this was edited and posted, and here it is: in the Old Norse text, for ‘ørmul þau’ (accusative) in the last two lines, I ought to have written ‘ørm(u)lum þeim’ (dative), as the thing you rob (‘ræna’) is dative. The grammar of this part is right in the Modern Icelandic text (‘urmul’ is the dative of ‘urmull’), which lulled me into not noticing this discrepancy in the Old Norse—and my surprise that ‘ørmul’ and ‘urmull’ aren’t the same grammatical gender distracted me, as you rarely see that happen.*
What's the difference between Old Norse and Modern Icelandic? A professional who's taught both demonstrates with a parallel text in each (Jackson Crawford taught the Old Norse language at UCLA from 2011-14 and the Modern Icelandic language at UC Berkeley from 2015-17).
Jackson Crawford, Ph.D.: Sharing real expertise in Norse language and myth with people hungry to learn, free of both ivory tower elitism and the agendas of self-appointed gurus. Visit JacksonWCrawford.com (includes bio and linked list of all videos).