Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) used to say: "Do not mix into the Qur'an what is not in it. These are only two Mu'awwidhat with which the Prophet (peace and blessings be upon him) used to seek refuge: 'Say: I seek refuge with the Lord of the daybreak' (Surah al-Falaq) and 'Say: I seek refuge with the Lord of mankind' (Surah al-Nas)." And Sayyiduna Abdullah (may Allah be pleased with him) used to erase them from the mushaf.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9119