Is it obligatory to stop working and repeat what the muezzin says upon hearing the call to prayer, or is it permissible to combine both, and which is better?

Repeating the Adhan is a Sunnah according to the majority of scholars, and it does not necessitate interrupting one's work, unless the person is engaged in prayer. In this case, one should not interrupt the prayer to repeat the Adhan nor repeat it during the prayer, according to the majority of scholars. The Malikis, however, hold that one may repeat it if one is performing a supererogatory prayer, but not an obligatory one. It is permissible to repeat the Adhan even if one is reciting the Quran.