What is the reason for mentioning prayer (Salah) and fasting (Sawm) in books of Islamic creed (Aqidah), and how does the verse "But Allah has endeared to you belief" indicate that faith (Iman) is both قول وعمل (a statement and an action)?

Prayer and fasting are among the pillars of Islam, and the author has clarified the three ranks of religion: Islam, Iman (faith), and Ihsan (excellence). The noble verse: "But Allah has endeared to you faith and has made it pleasing in your hearts, and has made hateful to you disbelief, defiance, and disobedience. Those are the rightly guided" indicates that Iman (faith) is from the actions and sayings of the heart, and it includes the saying of the heart and tongue, and the action of the heart, tongue, and limbs, and all acts of obedience.