When the Iqāmah (second call ) for prayer is pronounced, no prayer is to be offered but the obligatory one

Abu Hurayrah (may Allah be pleased with him) reported that the Prophet (ﷺ) said: "When the Iqāmah (second call ) for prayer is pronounced, no prayer is to be offered but the obligatory one."

The Prophet (ﷺ) prohibited anyone who is in the mosque from beginning a voluntary prayer after the Iqāmah has been pronounced for the obligatory prayer.