Ahmad and Abu Dawud transmitted it from Abu Huraira, and they added at the beginning, “He who has not performed ablution is not credited with observing prayer”.
Hadith ReferenceMishkat al-Masabih / The Book of Purification / Hadith: 403
Hadith Gradingالألبانی:لم تتمّ دراسته | زبیر علی زئی:حسن
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «حسن، رواه أحمد (2/ 418 ح 9408) و أبو داود (101) [و ابن ماجه: 399]»