Abu Waail reported,

A man called Nuhayk bin Sinan came to Abdullah, with a narration like the hadith of Waki, except that he said, "Then Alqama came to enter upon him, so we said to him, 'Ask him about the similar surahs that the Messenger of Allah ﷺ used to recite together in a single rakah.'"He went in to him, asked him, then came back out to us and said, "Twenty surahs from the Mufassal, according to the arrangement of Abdullah."

Muslim 1909

Sahih

و حدثنا أبو كريب حدثنا أبو معاوية عن الأعمش

عن أبي وائل قال

جاء رجل إلى عبد الله يقال له نهيك بن سنان بمثل حديث وكيع غير أنه قال فجاء علقمة ليدخل عليه فقلنا له سله عن النظائر التي كان رسول الله ﷺ يقرأ بها في ركعة فدخل عليه فسأله ثم خرج علينا فقال عشرون سورة من المفصل في تأليف عبد الله

مسلم 1909صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Muslim
Book
Virtues of the Quran and what relates to it
Chapter
Reciting with measured pace and avoiding hastiness, which is excessive speed, and the permissibility of reciting two or more surahs in a rakat
Numbering
Darussalam 1909
Muslim 1909