Perform the prayers at sunset, at nightfall and at dawn; the dawn prayer is witnessed. And pray for a part of the night, an additional duty for you; it may be that your Lord will raise you up to an honourable station.

(17:78-79)

Be constant in praying at the beginning and the end of the day, and in the night too. Good deeds make amends for sins. That is a reminder for the mindful. Therefore have patience; God will not leave to waste the reward of the righteous.

(11:114-115)

And when you have performed the prayer, remember God, standing, sitting and lying down. Then, when you are secure, perform the prayer, for prayer is a duty incumbent on the faithful, to be observed at appointed hours.

(4:103)

Recite what has been revealed to you of the Book, and perform the prayer; prayer prevents indecency and the evil. God's remembrance is greatest of all. And God knows what you do.

(29:45)

Be ever mindful of prayers, and of the midmost prayer. And stand obedient to God.

(2:238)