﴿ وَلَمَّا وَقَعَ عَلَيْهِمُ ٱلرِّجْزُ قَالُوا۟ يَٰمُوسَى ٱدْعُ لَنَا رَبَّكَ بِمَا عَهِدَ عِندَكَ ۖ لَئِن كَشَفْتَ عَنَّا ٱلرِّجْزَ لَنُؤْمِنَنَّ لَكَ وَلَنُرْسِلَنَّ مَعَكَ بَنِىٓ إِسْرَٰٓءِيلَ ﴾

“And whenever a plague struck them, they would cry: "O Moses, pray for us to thy Sustainer on the strength of the covenant [of prophethood] which He has made with thee! If thou remove this plague from us, we will truly believe in thee. and will let the children of Israel go with thee!"”

And when the terror the chastisement fell upon them they said ‘O Moses pray to your Lord for our sake by the covenant which He has made with you to remove the chastisement from us if we believe. Indeed if la-in the lām is for oaths you remove from us the terror verily we will believe in you and let the Children of Israel go with you’.