Al-Harith al-A'war (may Allah have mercy on him) relates: I came to Sayyiduna Ali (may Allah be pleased with him) after Isha, and he asked: "What brings you at this hour?" I said: "I love you." He said: "By Allah! Do you really love me?" I said: "Yes, by Allah! I love you." At that he said: "Shall I not teach you a supplication which the Prophet (peace and blessings be upon him) taught me?" I said: "Certainly!" He said: "Say: 'Allahumma-ftah masami'a qalbi li-dhikrika, warzuqni ta'ataka wa ta'ata rasulika, wa 'amalan bi-kitabik' (O Allah, open the ears of my heart to Your remembrance, and grant me obedience to You and obedience to Your Messenger, and acting upon Your Book)."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is not narrated from Sayyiduna Ali (may Allah be pleased with him) except with this chain, and Muhammad bin Sawa' (may Allah have mercy on him) is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الألف / 1286
Hadith Gradingمحدثین:إسناده ضعيف لضعف الحارث
Hadith Takhrij«قال الهيثمي: والحارث ضعيف «مجمع الزوائد ومنبع الفوائد، ج 10، ص 182»» «أخرجه الطبراني فى «الأوسط» برقم: 5341»