Answered by Shaykh Faraz Rabbani
Is it correct to say “Sayyidina” Muhammad, and “Sayyidina” Ibrahim during the salawat after the tashahud in the prayer?
Imam al-Haskafi mentioned in his Durr al-Mukhtar that it is recommended to do so, and this was confirmed by Ibn Abidin in his supercommentary (Hashiya) on the text. This is also mentioned in Imam Zafar Ahmad Usmani’s I`la’ al-Sunan, a 21-volume masterpiece outlining the hadith proofs for the Hanafi school, with commentary, and in Ahsan al-Fatawa, and other works.
However, this applies to the Salat al-Ibrahimiyya (DurudSharif), not the Tashahhud itself, where one should not add “Sayyidina.”
All blessings and the best of peace on our Master Muhammad, his folk, companions and followers.
Wassalam,
Faraz Rabbani