Why is there no explicit Hadith stating that the Abrahamic Prayer should be recited in the final Tashahhud? And why did the ruling on reciting it in the final Tashahhud differ between the Hanafis and the Shafi’is? Does this indicate that it is originally unsound and that it was something added to the prayer by al-Shafi’i in triumph of his Qurayshi lineage?

The questions and issues raised are not valid as evidence to prove or discuss a jurisprudential ruling, because legal rulings are not established solely by explicit evidence that is not open to interpretation. The disagreement among scholars does not necessitate the invalidity of a ruling, as the Shafi'is and Hanafis differ on many rulings. Scholars have differed on the ruling regarding the Ibrahimiyyah prayer in the final tashahhud, oscillating between obligation and Sunnah. Imam Al-Shafi'i was not the only one who held it to be obligatory; many scholars, such as the Hanbalis and Ibn al-Arabi from the Malikis, also held this view. Those who assert its obligation rely on the saying of the Prophet, peace and blessings be upon him: "Say: O Allah, bless Muhammad and the family of Muhammad," as the command here implies obligation.

It is obligatory to respect and revere scholars, and not to disparage them or accuse them unjustly.