Madani Pearls About Recitation The Holy Quran (02/21)

It is Musta ab to recite Ta’awwuz  اَعُوْذُ بِا للہ when beginning Tilawat, and it is Sunnah to recite Tasmiyah ‘بِسْمِ اللہ at the start of a Surah, otherwise it is Musta ab.

(Bahar-e-Shari’at, vol. 1, part 3, pp. 550)