The statement of the Prophet (ﷺ) "Islam is based on five principles"

And belief is both saying and acting, and it increases and decreases. Allah تعالى revealed the following Verses concerning the subject: "That they may grow more in faith along with their (present) faith." (V.48:4) "And We increased them in guidance." (V.18:13) "And Allah increases in guidance those who walk aright [true believers in the Oneness of Allah - who fear Allah much (abstain from all kinds of sins and evil deeds which He has forbidden) and love Allah much (perform all kinds of good deeds which He has ordained)]" (V.19:76). And said, "As for those who accept guidance, He (i.e. Allah جل جلاله) increases their guidance and bestows on them their piety." (V.47:17) "And the believers may increase in faith." (V.74:31) "Which of you has had his faith increased by it? As for those who believe, it has increased their faith." (V.9:124) And, also the Statement of Allah تعالى: "Fear them. But it (only) increased them in faith.'" (V.3:173) And also the Statement of Allah جل جلاله: "And it only added to their faith and to their submissiveness (to Allah)." (V.33:22). And to love and hate for Allah's sake is a part of faith. 'Umar bin 'Abdul 'Aziz wrote to 'Adi bin 'Adi: "Belief includes Fara'id (enjoined duties), legal laws and Hudud (Allah's boundary limits between lawful and unlawful things) and Sunan [legal ways and deeds (acts) of worship etc.]. And whoever follows (and acts on) all of them completely, has a complete belief, and whoever does not follow them completely (does not act on them), his belief is incomplete. And should I live I will tell you all about them so that you may act on them. And should I die, I am not anxious to have your company." And the Prophet (ﷺ) Ibrahim (Abraham) عليه السلام‎ said, "But to be stronger in faith" (V.2:260). Mu'adh said (to Aswad bin Hilal, one of his companions), "Let us sit for a while so that we may dedicate that period of time to faith." lbn Mas'ud said, "Yaqin is perfect faith." And Ibn 'Umar said, "A person cannot attain true sense of piety unless and until he removes all suspicions from his heart." (i.e. gives up all kinds of polytheism, evil deeds, and doubtful things, and start doing righteous good deeds regularly) [See Fath Al-Bari, Vol. I, Page 54]. And Mujahid said, "He (Allah تعالى) has ordained for you…” (V.42:13) means "0 Muhammad (ﷺ)! We have ordained for you and him (Noah) one religion (i.e. Islamic Monotheism).” And Ibn 'Abbas explained: "A law and a clear way" (V.5:48) as Islamic way and Sunna (traditions of the Prophet (ﷺ) ﷺ).