Surah Al-Baqarah 2:50

وَإِذْ فَرَقْنَا بِكُمُ ٱلْبَحْرَ فَأَنجَيْنَـٰكُمْ وَأَغْرَقْنَآ ءَالَ فِرْعَوْنَ وَأَنتُمْ تَنظُرُونَ

And [recall] when We parted the sea for you and saved you and drowned the people of Pharaoh while you were looking on.

Translation: Saheeh International

Tafsir

And remember when We divided split in two for you on account of you the sea such that you were able to cross it and escape from your enemy; and We delivered you from drowning and drowned Pharaoh’s folk his people with him while you were beholding the sea crashing down on top of them.

Excerpt from Tafsir al-Jalalayn, commentary on 2:50, via Quran.com. The reader has the full commentary and 9 more tafsirs.