Benefits and Issues: Reciting the tashahhud at the beginning of an important sermon, speech, or lesson is an emphasized Sunnah.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 4841
Hafiz Zubair Ali Zai
The following sermon is authentically established from the Messenger of Allah sallallahu alayhi wa sallam in an absolute sense: «إِنَّالْحَمْدَلِلّٰهِنَحْمَدُهُوَنَسْتَعِيْنُهُ،مَنْيَّهْدِهِاللهُفَلاَمُضِلَّلَهُوَمَنْيُّضْلِلْفَلاَهَادِيَلَهُ،وَأَشْهَدُأَنلاَّإِلٰهَإِلاَّاللهُوَحْدَهُلَاشَرِيْكَلَهُوَ (أَشْهَدُ) أَنَّمُحَمَّدًاعَبْدُهُوَرَسُوْلُهُ،أَمَّابَعْدُ:»[صحيح مسلم: 868، سنن النسائي 6/ 89۔ 90 ح 3280 وسنده صحيح والزيادة منه] «فَإِنَّخَيْرَالْحَدِيْثِكِتَابُاللهِ،وَخَيْرَالْهَدْيِهَدْيُمُحَمَّدٍ صلى الله عليه وسلم وَشَرَّالْأُمُوْرِمُحْدَثَاتُهَاوَكُلَّبِدْعَةٍضَلاَلَةٌ»[صحيح مسلم: 867] It is narrated from Sayyiduna Abu Hurairah radi Allahu anhu that the Prophet sallallahu alayhi wa sallam said: “Every sermon in which there is no tashahhud is like a hand afflicted with leprosy (i.e., defective and incomplete).” [سنن ابي داود: 4841، وسنده صحيح وصححه الترمذي: 1106، و ابن حبان: 1994، 579] By tashahhud is meant the testimony of faith (kalimat al-shahadah). See: [عون المعبود 4/ 409] ... For the original article, see ... Monthly Al-Hadith, Issue 75, page 17 and Ilmi Maqalat, Volume 3, page 157
Source: Research and Scholarly Articles by Shaykh Zubair Ali Zai, Page: 157