Imam Ahmad recorded from Zirr bin Hubaysh that Ubayy bin Ka`b رضي الله عنه told him that Ibn Mas`ud رضي الله عنه did not record the Mu`awwidhatayn in his Mushaf (copy of the Qur'an). So Ubayy رضي الله عنه said, ''I testify that the Messenger of Allah صلى الله عليه وسلم informed me that Jibril عليه السلام said to him " قُلْ أَعُوذُ بِرَبِّ الْفَلَقِ Say: ''I seek refuge with the Lord of Al-Falaq.'' " So he said it. And Jibril عليه السلام said to him " قُلْ أَعُوذُ بِرَبِّ النَّاسِ Say: ''I seek refuge with the Lord of mankind.'' " So he said it. Therefore we say what the Prophet صلى الله عليه وسلم said.'' Why wasn’t the Mu’awwidhatayn in the Mushaf of Ibn Mas’ud?