Faith, then, is to believe in Allah, His angels, His Books, and His messengers.
Alliance with Allah varies according to one’s deeds: some people enjoy complete friendship, while others are friends only in a limited sense. The latter is the sinning believer—an ally of Allah through his obedience, but an enemy of Allah through his disobedience and defiance. Still others are pure enemies, like the unbeliever and the polytheist.
This is the truth. As for those who maintain that no one is a friend of Allah unless a shrine or mausoleum has been erected over his grave, and that whoever lacks such a tomb is not a saint—as is claimed by the grave-worshippers—this is false.
As stated earlier, the definition of faith is verbal confession, inward affirmation, and bodily action; it increases with obedience and decreases with sin (1). What the author has listed here are its pillars, as the Prophet ﷺ clarified when Gabriel asked him, “Inform me about faith.” He replied, “Faith is to believe in Allah, His angels, His Books, His messengers, the Last Day, and to believe in divine decree, both its good and its evil.” (2)