Some worshipers interrupt the supererogatory Salah (Prayers) they are performing once the obligatory Salah commences;
is this permissible?
(Part No. 7; Page No. 240)
Once the obligatory Salah commences, it is not permissible to start offering a supererogatory Salah. This is based on the general ruling in the Hadith of the Prophet (peace be upon him):
When Iqamah is announced, there should be no Salah except the obligatory one.
Muslim and others)
Accordingly, when the obligatory Salah commences while a worshiper is offering a supererogatory one, they should stop it in compliance with the Hadith mentioned previously; also because the obligatory Salah takes precedence.