﴿ وَقَالُوا۟ مَهْمَا تَأْتِنَا بِهِۦ مِنْ ءَايَةٍۢ لِّتَسْحَرَنَا بِهَا فَمَا نَحْنُ لَكَ بِمُؤْمِنِينَ ﴾

“And they said [unto Moses]: "Whatever sign thou mayest produce before us in order to cast a spell upon us thereby, we shall not believe thee!"”

And they said to Moses ‘Whatever sign you bring us to cast a spell upon us therewith we will not believe in you’ and so he Moses invoked God against them.