Surah Ya-Sin 36:24
إِنِّىٓ إِذًا لَّفِى ضَلَـٰلٍ مُّبِينٍ
Indeed, I would then be in manifest error.
Translation: Saheeh International
Tafsir
Truly then in other words in the case of me worshipping gods other than God I would be in manifest error.
Excerpt from Tafsir al-Jalalayn, commentary on 36:24, via Quran.com. The reader has the full commentary and 9 more tafsirs.