Muslims are required to pray five obligatory prayers every single day, at various times. This is mentioned in the Qur'an:
"Indeed, prayer has been decreed upon the believers - a decree of fixed times." [The Qur'an: an-Nisā 4:103]
The prayer times are mentioned in the following narrations:
'Abdullāh b. 'Amr ibn al-'Aas reported:
The Messenger of Allah (may the peace and blessings of Allah be upon him) was asked about the times of prayers. He said: The time for the morning prayer lasts as long as the first visible part of the rising sun does not appear, and the time of the noon prayer is when the sun moves past its zenith [and lasts as long as] it is not time for the afternoon prayer, and the time for the afternoon prayer is so long as the sun does not become pale and the first visible part of it does not set, and the time for the evening prayer is when the sun disappears and it lasts until the twilight is no more, and the time for the night prayer is up to midnight. [Muslim: 612]
The five obligatory prayers should be performed according to this order:
"The Prophet (may the peace and blessings of Allah be upon him) was asked: 'Which deed is the best?' So he said: 'Prayer at the beginning of its time.'" [at-Tirmidhi: 170]
"Whoever catches up with a prostration of Fajr before the sun rises, then he has caught up with it; and whoever catches up with a prostration of 'Asr before the sun sets, then he has caught up with it." [an-Nasā'ī: 555]