And that it is He who is the Lord of Sirius
The following excerpt is taken from “Tafsir Ibn Kathir” Surah 53 pg. 47:
Ibn Abbas, Mujahid, Qatadah and Ibn Zayd said about Ash-Shi`ra that it is the bright star, named Mirzam Al-Jawza’ (Sirius), which a group of Arabs used to worship.
Kathir, Ibn. Tafsir Ibn Kathir. (Surah 53 pg. 47). http://www.islamicweblibrary.com/wp-content/uploads/2020/10/053Najam.pdf