It is narrated from Sayyiduna Ali (may Allah be pleased with him) what serves as evidence for prompting the imam.
Abu Dawud said: Abu Ishaq heard only four hadiths from al-Harith, and this is not one of them. Al-Harith is not used as evidence.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5791