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) said: "Whoever prays the Isha prayer in congregation and then prays four rak'ahs before leaving the mosque, this will earn him a reward equal to Laylat al-Qadr (the Night of Decree)."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Sayyiduna Ibn Umar (may Allah be pleased with them both) except Muharib bin Dithar, and no one from Muharib except Abu Hanifah, and Ishaq al-Azraq is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 5239
Hadith Gradingمحدثین:إسناده ضعيف
Hadith Takhrij«قال الهيثمي: في إسناده ضعيف غير متهم بالكذب «تحفة الأحوذي شرح سنن الترمذي، ج 1، ص 191»» «أخرجه الطبراني فى «الكبير» برقم: 13800»