﴿ قَالَ بَلْ أَلْقُوا۟ ۖ فَإِذَا حِبَالُهُمْ وَعِصِيُّهُمْ يُخَيَّلُ إِلَيْهِ مِن سِحْرِهِمْ أَنَّهَا تَسْعَىٰ ﴾

“He answered: "Nay, you throw [first]." And lo! by virtue of their sorcery, their [magic] ropes and staffs seemed to him to be moving rapidly:”

Please check ayah 20:70 for complete tafsir.