I say, and with God's success: It starts from the sunset of twilight until the dawn rises, and the Witr prayer should not be performed before the Isha prayer; due to the necessity of order, not because the time for Witr has not entered; for Abu Huraira, may God be pleased with him, said that the Prophet, peace be upon him, said: "Indeed, for prayer there is a beginning and an end. The first time for the Dhuhr prayer is when the sun has passed its zenith, and its last time is when the time for Asr enters. The first time for the Asr prayer is when its time enters, and its last time is when the sun turns yellow. The first time for Maghrib is when the sun sets, and its last time is when the horizon disappears. The first time for the Isha prayer is when the horizon disappears, and its last time is when half of the night has passed. The first time for Fajr is when dawn breaks, and its last time is when the sun rises." In Sunan Al-Tirmidhi 1: 284, and its narrators are the narrators of the group except for Hanad, as mentioned in I'laa Al-Sunan 2: 10. And from Abdullah bin Rafi', the freedman of Umm Salama, the wife of the Prophet, peace be upon him, that he asked Abu Huraira, may God be pleased with him, about the time of prayer, and Abu Huraira said: "I will inform you: Pray Dhuhr when your shadow is the same length as you, and Asr when your shadow is twice your length, and Maghrib when the sun sets, and Isha between you and a third of the night, and pray Fajr in the twilight, meaning the early dawn." In Al-Muwatta of Malik 1: 8, and Musannaf Abdul Razzaq 1: 450, and its chain is authentic as mentioned in I'laa Al-Sunan 2: 9. From Jabir, may God be pleased with him, who said: "Gabriel, peace be upon him, came to the Prophet, peace be upon him, when the sun had passed its zenith, and said: 'Stand up, O Muhammad, and pray Dhuhr when the sun has tilted.' Then he waited until the shadow of a man was equal to him and came to him for Asr, saying: 'Stand up, O Muhammad, and pray Asr.' Then he waited until the sun had set and came to him, saying: 'Stand up and pray Maghrib.' So he stood and prayed it when the sun had set. Then he waited until the twilight disappeared and came to him, saying: 'Stand up and pray Isha.' So he stood and prayed it. Then he came to him when the dawn light was bright in the morning, saying: 'Stand up, O Muhammad, and pray.' So he stood and prayed Fajr. Then he came to him the next day when the shadow of a man was equal to him, saying: 'Stand up, O Muhammad, and pray.' So he prayed Dhuhr. Then he came to him when the shadow of a man was twice his length, saying: 'Stand up, O Muhammad, and pray.' So he prayed Asr. Then he came to him for Maghrib when the sun had set at one time that did not change, saying: 'Stand up and pray.' So he prayed Maghrib. Then he came to him for Isha when a third of the first night had passed, saying: 'Stand up and pray.' So he prayed Isha. Then he came to him for Fajr when it was very bright, saying: 'Stand up and pray.' So he prayed Fajr, saying: 'What is between these two times is all a valid time.'" In Sunan Al-Nasa'i Al-Kubra 1: 471, and Al-Mujtabaa 1: 263, and God knows best.