"Whoever leaves the prayer intentionally and deliberately, God will cast him into the Fire for eighty Haqabs; a Haqab is eighty years, a year is eighty months, a month is eighty days, a day is eighty hours, and an hour is a thousand years of what you count."

And the Prophet (PBUH) said:

"Whoever leaves the Fajr [Dawn] prayer, Faith dissociates from him; and whoever leaves the Zuhr [Noon] prayer, the Prophets dissociate from him; and whoever leaves the Maghrib [Sunset] prayer, the Quran dissociates from him; and whoever leaves the Isha [Night] prayer, the Merciful dissociates from him."

And this indicates that he who denies a person from among the persons of these times—who are the Five Prayers—intentionally and deliberately, then he is a disbeliever; not that the one who misses a time among these [physical] times is a disbeliever, and that is because there is no one among the people except that some of these exoteric times pass him by.

Why did He not name Ali and his Household in His Book?... Anthropomorphism (Tashbih), Negation (Nafi), Affirmation (Ithbat).

And if someone says: "Why did God Almighty not name these prayers with the names of these persons?" We say to him as al-Sadiq said in the book al-Safi to the man who asked: "People say, what is with Him that He did not name Ali and his household in His book?" replying to him: