Tafseer Ibn Kathir of ASY SYU'ARAA' [41]

فَلَمَّا جَاء السَّحَرَةُ قَالُوا لِفِرْعَوْنَ أَئِنَّ لَنَا لَأَجْرًا إِن كُنَّا نَحْنُ الْغَالِبِينَ

And when the magicians arrived, they said to Pharaoh, "Is there indeed for us a reward if we are the predominant?"