This is what We recite to you of the verses and the Wise Reminder.
meaning, "What We narrated to you, O Muhammad, regarding `Isa, his birth and his life, is what Allah conveyed and revealed to you, sent down from the Al-Lawh Al-Mahfuz (The Preserved Tablet). So there is no doubt in it.
Similarly, Allah said in Surah Maryam;
ذلِكَ عِيسَى ابْنُ مَرْيَمَ قَوْلَ الْحَقِّ الَّذِى فِيهِ يَمْتُرُونَ
مَا كَانَ للَّهِ أَن يَتَّخِذَ مِن وَلَدٍ سُبْحَـنَهُ إِذَا قَضَى أَمْراً فَإِنَّمَا يَقُولُ لَهُ كُن فَيَكُونُ
Such is `Isa, son of Maryam. (It is) a statement of truth, about which they doubt (or dispute). It befits not Allah that He should beget a son. Glorified be He. When He decrees a thing, He only says to it: "Be!" and it is. (19:34-35)