Abdul Rahman bin Yazid and Abdul Rahman bin al-Aswad narrate: Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) used to perform the prostration of recitation at the first verse of Ha Mim, Tanzilun min al-Rahman al-Rahim.
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators are thiqat (trustworthy).