﴿ فَأَوْحَيْنَآ إِلَىٰ مُوسَىٰٓ أَنِ ٱضْرِب بِّعَصَاكَ ٱلْبَحْرَ ۖ فَٱنفَلَقَ فَكَانَ كُلُّ فِرْقٍۢ كَٱلطَّوْدِ ٱلْعَظِيمِ ﴾

“Thereupon We inspired Moses thus: Strike the sea with thy staff!”- whereupon it parted, and each part appeared like a mountain vast.”

Please check ayah 26:68 for complete tafsir.