﴿ وَلَقَدْ خَلَقْنَا ٱلسَّمَٰوَٰتِ وَٱلْأَرْضَ وَمَا بَيْنَهُمَا فِى سِتَّةِ أَيَّامٍۢ وَمَا مَسَّنَا مِن لُّغُوبٍۢ ﴾

“and [who knows that] We have indeed created the heavens and the earth and all that is between them in six aeons, and [that] no weariness could ever touch Us.”

Please check ayah 50:40 for complete tafsir.