Every Surah of the Quran opens with the Basmalla (I begin with the name of Allah, the Kind, the Caring). However, Surah Tawbah is an exception. The commentators think this is because this surah expresses Divine anger and annoyance severely. It displays Allah’s anger, so it starts without the Basmalla, others say that this Surah is a continuation of the previous Surah Al-Anfal. The answer to this question specifically, regarding which surah has two Basmallas is Surah Naml, the second Basmalla is a quotation from the letter of Prophet Sulaiman to Queen of Sheba, verse 30. This is why Surah Naml is also known as the Surah with two Bismillahs.