It was narrated from 'Ata' bin Yazid that he heard Abu Sa'eed Al-Khudri say:
"I heard the Messenger of Allah (ﷺ) say: 'There is no prayer after Fajr until the sun has clearly risen, and no prayer after 'Asr until the sun has fully set.'"
English reference: Vol. 1, Book 6, Hadith 568
Arabic reference: Book 6, Hadith 572