It is narrated from Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "My Ummah will continue to pray these four rak'ahs before Asr until it walks upon the earth having been granted certain and definite forgiveness."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Sayyiduna Ali (may Allah be pleased with him) only with this chain."
Hadith Referenceالمعجم الأوسط / باب الميم / 5131
Hadith Gradingمحدثین:إسناده ضعيف جدًّا، فيه عبد الملك بن هارون بن عنترة متروك
Hadith Takhrij«قال الهيثمي: فيه عبد الملك بن هارون بن عنترة وهو متروك «مجمع الزوائد ومنبع الفوائد، ج 2، ص 222»»