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Mas’ala 1812المهذبShafi'ivol. 4, p. 238vol. 4, p. 238

وَإِنْ كَانَ سَهْوُهُ فِي تَرْكِ سُنَّةٍ لَزِمَهُ مُتَابَعَتُهُ لِأَنَّ الْمُتَابَعَةَ فَرْضٌ فَلَا يَجُوزُ أَنْ يَشْتَغِلَ بِسُنَّةٍ

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Its commentaries

المجموع شرح المهذبal-Nawawi

its words on this mas’ala come with mas’ala 1803 before it

A number in a circle: a mas’ala the commentary adds, numbered through it. In bold: the text’s own words inside the commentary.