Musnad Ahmad Hadith 23532

It is narrated from Abu Ayyub Ansari (may Allah be pleased with him) that at the time of decline (zawal), the Holy Prophet (ﷺ) would always perform four rak‘ahs. One day I asked, "O Messenger of Allah! What is this prayer upon which I see you being so regular?" The Holy Prophet (ﷺ) replied, "At the time of decline, the gates of the heavens are opened and are not closed until the Zuhr prayer is performed. Therefore, I wish that at that time a good deed of mine ascends to the heavens." I asked, "O Messenger of Allah! Do you recite (Qur'an) in these four rak‘ahs?" The Holy Prophet (ﷺ) replied, "Yes!" I asked, "Is there salam after two rak‘ahs in them?" The Holy Prophet (ﷺ) replied, "No."