Are the statements attributed to Imam Ali (may God be pleased with him) regarding the reason for prostrating twice correct, and is the classification of those who pray into five degrees (a devoted worshipper, a successful worshipper, one who is rewarded, one who is deprived, and one who is punished) correct, and what is the difference between the first and second degrees, if this classification is correct?

We have not come across what was attributed to Ali (may Allah be pleased with him). The repetition of prostration in a single rak'ah is more expressive of humility, as it involves placing the most honorable part of a person's body (their face) on the earth. Prostration is the ultimate form of humility and servitude to Allah, and it is superior to bowing (ruku').

We have not come across the aforementioned classification of worshipers. Whoever performs the prayer completely according to the method of the Prophet (peace be upon him) is close to the mercy of Allah. The Prophet (peace be upon him) enjoined, "Pray as you have seen me pray."

Whoever is characterized by khushu' (devotional humility) in their prayer is among the successful, as Allah Almighty says: "Successful indeed are the believers those who are humble in their prayers." (23:1-2) And whoever strives for khushu' is rewarded, as Allah Almighty says: "As for those who strive in Our cause, We will surely guide them to Our ways." (29:69)

Whoever performs their prayer without khushu' has fulfilled its obligation, because khushu' is not a condition for the validity of the prayer. Whoever delays the prayer beyond its time without a legitimate excuse is disobedient to Allah, as Allah Almighty says: "But after them followed generations who neglected prayers and pursued passions; so they will surely meet perdition." (19:59) And His saying: "So woe to those who pray [But] who are heedless of their prayer." (107:4-5)