Sura Qāf 50:38

وَلَقَدْ خَلَقْنَا ٱلسَّمَٰوَٰتِ وَٱلْأَرْضَ وَمَا بَيْنَهُمَا فِى سِتَّةِ أَيَّامٍ وَمَا مَسَّنَا مِن لُّغُوبٍ

wa-la-qad khalaqnā l-samāwāti wa-l-arḍa wa-mā baynahumā fī sittati ayyāmin wa-mā massanā min llughūbin

We created the heavens and the earth and all between them in Six Days, nor did any sense of weariness touch Us.