It wasnarrated that Abu Sa'eed said:
"The Messenger of Allah (ﷺ)said: 'There is no prayer for the one who does not recite in everyRak'ah: Al-Hamd (Al-Fatihah) and a Surah whether in an obligatoryprayer or another.'" (PT)
English reference (PT): Vol. 1, Book 5, Hadith 839 (PT)
Arabic reference (PT): Book 5, Hadith 888 (PT)