Sayyiduna al-Harith bin Ghutayf (may Allah be pleased with him) (the narrator is unsure; perhaps the words are:) Sayyiduna Ghutayf bin al-Harith narrates: There are some things I have not forgotten, and I have not forgotten that I saw the Prophet (peace and blessings be upon him) placing his right hand over his left hand during prayer.
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 / 2606
Hadith Gradingمحدثین:إسنادہ صحیح۔
Hadith Takhrij«أخرجه مسند أحمد برقم: 16520، وأخرجه المعجم الكبير للطبراني برقم: 3400»