he asked Ibn Umar about the length of the two Rak'ah (before) Al-Fajr. He said: "The Prophet would pray two and two during the night, and he would perform Al-Witr with one Rak'ah. And he would pray two Rak'ah while he was hearing the Adhan [meaning that they were light]."
Reference: Jami` at-Tirmidhi 461 In-book : Book 3, Hadith 9 English translation : Vol. 1, Book 3, Hadith 461
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