Allah's Messenger said: "the key to Salat is the purification, its Tahrim is the Takbir, and its Tahlilis the Taslim, and there is no Salat for one who did not recite Al-Hamd and a Surah in the obligatory (prayer) or other prayers."
Reference: Jami` at-Tirmidhi 238 In-book : Book 2, Hadith 90 English translation : Vol. 1, Book 2, Hadith 238
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