Surah Sad 38:1 — translation and meaning

Saad. By the Qur’ān containing reminder. The discussion on similar letters has already passed in the beginning of Sūrah Al-Baqarah. I swear by the Qur’ān which is full of admonition, reminding mankind that which benefits them in their worldly life and the Afterlife. The matter is not as the idolaters think, namely that Allah has partners beside Him.

Source: Al-Mukhtasar Tafsir — Tafsir Center for Quranic Studies.