Sahih al-Bukhari Book 9, Hadith 63
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.
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 pray as I saw my companions praying. I do not forbid praying at any time during the day or night except at sunset and sunrise.