From Sahih Muslim (Hadith 1932):
A'isha said that the Messenger of Allah (ﷺ) did not abandon observing two rak'ahs after 'Asr, but she reported Allah's Messenger (ﷺ) as saying:Do not get used to observe prayer at the time of the rising sun and at the time of its setting and (exhorted the Muslims) to pray at their times
Reference: Muslim 1932