It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) said: "Whoever prays four rak'ahs before Asr, Allah Almighty makes his body forbidden to the Fire." I said: O Messenger of Allah, I have seen you sometimes pray it and sometimes leave it. He (peace and blessings be upon him) said: "I am not like any one of them."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19915