It is narrated from al-Walid bin Kathir that he said: Nafi' told me that Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) would recite two or three of the Mufassal surahs in a single rak'ah of the obligatory prayers.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2464