Surah Al-A'raf 7:1
الٓمٓصٓ
Alif, Lām, Meem, Ṣād.
Translation: Saheeh International
Tafsir
Alif Lām Mīm Sād God knows best what He means by these letters.
Excerpt from Tafsir al-Jalalayn, commentary on 7:1, via Quran.com. The reader has the full commentary and 9 more tafsirs.