Is there any evidence from the Qur’an or Sunnah supporting the prolongation of standing after rising from bowing in the second raka‘ah of the Fajr prayer, as mentioned by Ibn al-Qayyim in "Zad al-Ma'ad"?

Reciting Qunūt after rising from the second rakʿah in the Fajr prayer is prescribed according to many scholars, and there is a wide difference of opinion on this matter. Whoever omits this Qunūt, their prayer is valid.

The Shāfiʿīs are of the opinion that Qunūt in Fajr prayer is recommended whether a calamity has befallen or not, and they base their evidence on the actions of the Companions and the Tābiʿūn. This is also the view of Mālik and Dāwūd. While others, such as Abū Ḥanīfah and Aḥmad, are of the opinion that it is not prescribed in the Fajr prayer.

Ibn al-Qayyim explained that the Prophet, peace be upon him, performed Qunūt and also omitted it, and that Companions like Abū Hurayrah used to perform Qunūt in the last rakʿah of the Fajr prayer. The people of Hadith take a middle ground on this issue, following the Prophet, peace be upon him, in both his actions and omissions. They do not censure those who regularly perform it nor those who omit it, for whoever performs Qunūt has done well, and whoever omits it has also done well.

No verse from the Book of Allah the Almighty has been reported regarding the legitimacy of Qunūt.