Imam al-Daraqutni (may Allah have mercy on him) said: Abu al-Janub is da'if (weak). Imam al-Shafi'i (may Allah have mercy on him) said: Regarding the hadith of Abu Juhayfah (may Allah be pleased with him) from Ali (may Allah be pleased with him): how could it be that Ali (may Allah be pleased with him) would narrate something from the Prophet (peace and blessings be upon him) and then act contrary to it?
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنايات / 15935