The Letter Qaf 50:28. Juz 26, page 519.
قَالَ لَا تَخْتَصِمُوا۟ لَدَىَّ وَقَدْ قَدَّمْتُ إِلَيْكُم بِٱلْوَعِيدِ٢٨
He saith: Contend not in My presence, when I had already proffered unto you the warning.
Qaf 50:28, translated by Marmaduke Pickthall