Is it obligatory to renew the ablution, or is the first ablution sufficient for performing two rak'ahs of supererogatory prayer after the emission of pre-seminal fluid (madhy) and before sunrise, knowing that he stays in the mosque after the dawn prayer to recite the Qur'an?

The emission of prostatic fluid (madhy) invalidates ablution (wudu'), and wudu' is necessary for the Ishraq prayer. If a person suffers from chronic prostatic fluid discharge ( سلس المذي - سلس المذي), their wudu' with which they prayed Fajr becomes invalid upon the departure of the Fajr prayer time (at sunrise), according to the Hanbalis and Shafi'is, and this is the more preponderant view within the Hanbali school. The more cautious approach is to repeat the ablution.