Sayyiduna Abu Ayyub al-Ansari (may Allah be pleased with him) said that the Prophet (peace and blessings be upon him) would always pray four rak'ahs in my house after the sun passed its zenith. I said: O Messenger of Allah, what is this prayer that you pray? Then he mentioned the hadith in the same way.
Ubaydah bin Mu'attib is da'if (weak); his report is not taken as proof. Abu Dawud said: Ubaydah is da'if (weak). It has also been narrated from Abu Ayyub through another chain that is not strong.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4580