The Letter Qaf 50:38. Juz 26, page 520.
وَلَقَدْ خَلَقْنَا ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضَ وَمَا بَيْنَهُمَا فِى سِتَّةِ أَيَّامٍ وَمَا مَسَّنَا مِن لُّغُوبٍ٣٨And verily We created the heavens and the earth, and all that is between them, in six Days, and naught of weariness touched Us.
Qaf 50:38, translated by Marmaduke Pickthall