Surah Fussilat 41:9

۞ قُلْ أَئِنَّكُمْ لَتَكْفُرُونَ بِٱلَّذِى خَلَقَ ٱلْأَرْضَ فِى يَوْمَيْنِ وَتَجْعَلُونَ لَهُۥٓ أَندَادًا ۚ ذَٰلِكَ رَبُّ ٱلْعَـٰلَمِينَ

Say, "Do you indeed disbelieve in He who created the earth in two days and attribute to Him equals? That is the Lord of the worlds."

Translation: Saheeh International

Tafsir

Say ‘Do you really read a-innakum pronouncing both hamzas or by not pronouncing the second one but inserting an alif between the two in both cases disbelieve in Him Who created the earth in two days Sunday and Monday and ascribe to Him associates? That is the Lord in other words the Possesser of all the Worlds …

Excerpt from Tafsir al-Jalalayn, commentary on 41:9, via Quran.com. The reader has the full commentary and 9 more tafsirs.