It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) was asked: "Which part of the night is most suitable for the acceptance of supplication?" He (peace and blessings be upon him) said: "The last inner part of the night."
Imam al-Tabarani (may Allah have mercy on him) said: "Only al-Ashja'i narrated this hadith from Sufyan."
Hadith Referenceالمعجم الأوسط / باب الحاء / 3428
Hadith Takhrij«أخرجه أبو يعلى فى «مسنده» برقم: 5682، والبزار فى «مسنده» برقم: 6167، والطبراني فى «الكبير» برقم: 14078، والطبراني فى «الصغير» برقم: 355»