Allah's Messenger (S) said: "The two Rak'ah of Fajr are better than the world and what is in it."
Jami` at-Tirmidhi Book 2, Hadith 269
← Previous Hadith "Whoever prays twelve Rak'ah in a day and night, a house will be built from him in Paradise: Four Rak'ah before Zuhr, two Rak'ah after it, two Rak'ah after Maghrib, two Rak'ah after Isha, and two Rak'ah before Fajr in the morning Salat."

Jami` at-Tirmidhi Book 2, Hadith 268 Next Hadith → "I watched the Prophet (S) for a month. In the two Rak'ah before Fajr he would recite: Say: "O you disbelievers!" and Say: "Allah is One"."

Jami` at-Tirmidhi Book 2, Hadith 270