when the torment would strike them they would ask moses pray for us to your lord through your covenant with him. if he saves us from the torment we shall certainly believe in you and permit you and the children of israel to leave.
ولما وقع عليهم الرجز قالوا يا موسى ادع لنا ربك بما عهد عندك لئن كشفت عنا الرجز لنؤمنن لك ولنرسلن معك بني إسرائيل