Verily, Allâh forgives not that partners should be set up with Him (in worship), but He forgives except that (anything else) to whom He wills; and whoever sets up partners with Allâh (in worship), he has indeed invented a tremendous sin. (Sûrah 4. An-Nisâ’, ayah 48)
al-Hilâlî & Muhsin Khân , The Noble Qur'ân
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Beneficial articles to read: https://abukhadeejah.com/ahmad-an-najmees-kitaab-at-tawheed-chapter-3-fear-of-falling-into-shirk/
https://abukhadeejah.com/the-fundamentals-of-tawheed-monotheism-part-4-the-three-categories/
https://www.troid.org/shirk-associating-a-partner-with-allah/