﴿ 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!"”

Please check ayah 7:135 for complete tafsir.