It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "When the sun rises at its rising in the same appearance as it has at the time of the Asr prayer when it sets, and at that time a man prays two rak'ahs with four prostrations, the reward of that day is written for him." And I think he (peace and blessings be upon him) said: "And it becomes an expiation for his sin and his wrongdoing." And I think he (peace and blessings be upon him) said: "So if he dies on that day, he will enter Paradise."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7759