Al-A'raf 7:134

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

Every time the penalty fell on them, they said: "O Moses! on your behalf call on thy Lord in virtue of his promise to thee: If thou wilt remove the penalty from us, we shall truly believe in thee, and we shall send away the Children of Israel with thee."