Sayyiduna Abdullah bin Abi Awfa (may Allah be pleased with him) narrates: A man came while we were in the row, praying behind the Prophet (peace and blessings be upon him). The man joined the row and said: "Allah is the Greatest, truly great; and I declare Allah Almighty free of every imperfection, morning and evening." The narrator says: The Muslims raised their heads and showed their disapproval of the man. The Muslims said: "Who is this man raising his voice above the voice of the Messenger of Allah?" When the Prophet (peace and blessings be upon him) had completed the prayer, he said: "Who is this man with the loud voice?" It was said: "O Messenger of Allah! It is this one." The Prophet (peace and blessings be upon him) said: "By Allah, I saw your words ascending towards the heaven until a door was opened for them, and they entered through it."
Ahmad and al-Tabarani in al-Mu'jam al-Kabir recorded it, and its narrators are "thiqat" (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2614
Hadith Gradingمحدثین:إسنادہ صحیح، اس کے تمام راوی ثقہ ہیں۔