What is the ruling on praying Witr with the Adhan of Fajr?

The questioner:
A man heard the call to Fajr prayer and prayed Witr. Is his action valid?

The Shaykh:
No. If the Adhan of Fajr is early, before the dawn, there is no harm. But if the Adhan of Fajr is at the appearance of the dawn, he must refrain and not pray Witr. However, he makes up the Witr during the Duha time after the sun has risen, and he makes it even in number. He makes it up and makes it even, just as the Prophet (peace and blessings be upon him) used to do. If he slept through his night prayer, the Prophet (peace and blessings be upon him) would make it up between the rising of the sun and the midday prayer, and he would make it even, may peace and blessings be upon him. Yes.

The presenter:
May Allah reward you,

The questioner:
The questioner says:

The Shaykh:
Because the Prophet (peace and blessings be upon him) continued his Witr until the late night, as you heard, until the late night means until the appearance of the dawn. This indicates that one does not pray Witr after the appearance of the dawn.