Found the following hamletworks.org entries referring to line 1791-2

View Commentary Note for 1791-2
1791-2 rie, be thou as chast as yce, as pure as snow, | thou shalt not escape ca-  

View Material Textual Note for 1791-2
1791-2 rie, be thou as chast as yce, as pure as snow, | thou shalt not escape ca-