"‏ إِنَّ لِلصَّلاَةِ أَوَّلاً وَآخِرًا وَإِنَّ أَوَّلَ وَقْتِ صَلاَةِ الظُّهْرِ حِينَ تَزُولُ الشَّمْسُ وَآخِرَ وَقْتِهَا حِينَ يَدْخُلُ وَقْتُ الْعَصْرِ وَإِنَّ أَوَّلَ وَقْتِ صَلاَةِ الْعَصْرِ حِينَ يَدْخُلُ وَقْتُهَا وَإِنَّ آخِرَ وَقْتِهَا حِينَ تَصْفَرُّ الشَّمْسُ وَإِنَّ أَوَّلَ وَقْتِ الْمَغْرِبِ حِينَ تَغْرُبُ الشَّمْسُ وَإِنَّ آخِرَ وَقْتِهَا حِينَ يَغِيبُ الأُفُقُ وَإِنَّ أَوَّلَ وَقْتِ الْعِشَاءِ الآخِرَةِ حِينَ يَغِيبُ الأُفُقُ وَإِنَّ آخِرَ وَقْتِهَا حِينَ يَنْتَصِفُ اللَّيْلُ وَإِنَّ أَوَّلَ وَقْتِ الْفَجْرِ حِينَ يَطْلُعُ الْفَجْرُ وَإِنَّ آخِرَ وَقْتِهَا حِينَ تَطْلُعُ الشَّمْسُ ‏"

Allah's Messenger said: "Indeed for (the time of) Salat (there is a) beginning and an end. The beginning of the time for the Zuhr prayer is when the sun passes the zenith, and the end of its time is when the time for Asr enters. The beginning of the time for the Asr [prayer] is when its time enters, and the end of its time is when the sun yellows (turns pale). The beginning of the time of Maghrib is when the sun as set, and the end of its time is when the twilight has vanished (i.e., the horizon is invisible because of darkness). The beginning of the time for Isha, the later one, is when the horizon has vanished, and the end of its time is when the night is at its half. The beginning of the time for Fajr is when Fajr begins, and its end is when the sun rises."