Sahih al-Bukhari Book 9, Hadith 62
You offer a prayer which I did not see being offered by Allah's Messenger (ﷺ) when we were in his company
and he certainly had forbidden it (i.e. two rak`at after the `Asr prayer).
I heard Allah's Messenger (ﷺ) saying, "There is no prayer after the morning prayer till the sun rises, and there is no prayer after the `Asr prayer till the sun sets."
Allah's Messenger (ﷺ) forbade the offering of two prayers: -1. after the morning prayer till the sunrises. -2. after the `Asr prayer till the sun sets.