Silsilah as-Sahihah 724 — No Nafl prayer after Iqamah begins

Abu Huraira (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) saw a man praying while the mu’adhdhin was pronouncing the iqamah. The Prophet (peace and blessings be upon him) said to that man: “Are two prayers to be performed together (at the same time)?”