MN10 as in my earlier comment is the starting point. The German monk Nyanaponika Thera provides a detailed exposition. https://www.bps.lk/library-search-select

MN10 as in my earlier comment is the starting point. The German monk Nyanaponika Thera provides a detailed exposition. https://www.bps.lk/library-search-select.php?id=bp509s https://www.bps.lk/library-search-select.php?id=bp509s https://archive.org/details/10011341809-the-heart-of-buddhist-meditation https://archive.org/details/10011341809-the-heart-of-buddhis...