Surah Ash-Shu'ara 26:63

فَأَوْحَيْنَآ إِلَىٰ مُوسَىٰٓ أَنِ ٱضْرِب بِّعَصَاكَ ٱلْبَحْرَ ۖ فَٱنفَلَقَ فَكَانَ كُلُّ فِرْقٍ كَٱلطَّوْدِ ٱلْعَظِيمِ

Then We inspired to Moses, "Strike with your staff the sea," and it parted, and each portion was like a great towering mountain.

Translation: Saheeh International

Tafsir

God exalted be He says Thereupon We revealed to Moses ‘Strike the sea with your staff’ and he struck it whereupon it parted it split into twelve parts and each part was as a mighty mountain between each of these parts were paths which they followed such that not even the saddles or the felts of the riders were touched …

Excerpt from Tafsir al-Jalalayn, commentary on 26:63, via Quran.com. The reader has the full commentary and 9 more tafsirs.