(Al-Haaqa) 69 : 44
وَلَوْ تَقَوَّلَ عَلَيْنَا بَعْضَ الْأَقَاوِيلِ
And if he had invented some words upon Us!
That means if Messenger had inserted anything as his opinion in Lord’s Message. See explanation 10: 15-16; 17: 82; and 42: 52.