Yasar, the client of Ibn ‘Umar, said, “Ibn ‘Umar saw me while I was praying after the dawn had begun, and he said, ‘The Messenger of Allah came to us while we were praying at this time and he said, ‘Let your witness reach those who are absent that there is no prayer after (the beginning of) the dawn except two rak’ah.”
As to its place in the corpus of hadith, it is recorded by Ahmad and Abu Dawud. Although the hadith is weak, its numerous chains strengthen each other.
We can conclude from this that it is disliked to make voluntary prayers beyond the two sunnah rak’ah after the dawn has begun. This was stated by ash-Shaukani. Al-Hassan, ash-Shaifi, and Ibn Hazm say voluntary prayers are permissible at that time without any aspect of dislike. Malik openly allowed prayers during that time for those who missed the voluntary prayers during the night due to some excuse. It is mentioned that it reached him that ‘Abdullah ibn ‘Abbas, al-Qasim ibn Muhammad, and ‘Abdullah ibn ‘Aamar ibn Rabi’ah would pray the witr prayer after the dawn had begun. Said ‘Abdullah ibn Mas’ud, “It does not bother me if they make the iqamah (the second call) to prayer while I am praying witr.” Yahya ibn Sa’eed reported, “‘Ibadah ibn as-Samit was the imam for the people. One day he went to the morning prayer and the caller to prayer made the iqamah for the prayer. ‘Ibadah kept quiet until he prayed the witr prayer and then he led them in the morning prayer.” Sa’eed ibn Jubair reported that Ibn ‘Abbas slept (one night), woke up and told his servant, “Look to see what the people are doing.” (By that time he had lost his eyesight). The servant returned and told him that they were dispersing from the morning prayer. Ibn ‘Abbas then stood, prayed witr and prayed the morning prayer.