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Fir`awn's Pursuit and Expulsion of the Children of Israel, and how He and His People were drownedMore than one of the scholars of Tafsir said that Fir`awn set out with a huge group, a group containing the leaders and entire government of Egypt at that time, i.e., the decision-makers and influential figures, princes, ministers, nobles, leaders and soldiers.فَأَتْبَعُوهُم مُّشْرِقِينَ (So, they pursued them at sunrise.) means, they caught up with the Children of Israel at sunrise.

Source: Tafsir Ibn Kathir — abridged excerpt