And faith consists of both words and actions, and it increases and decreases. As Allah the Exalted has said: "That they may increase in faith along with their (present) faith." [سورة الفتح: 4] And He said: "And We increased them in guidance." [سورة الكهف: 13] And He said: "Allah increases in guidance those who are guided." [سورة مريم: 76] And He said: "Those who are guided, Allah increases them in guidance and grants them piety." [سورة محمد: 17] And He said: "The faith of those who believe increased." [سورة المدثر: 31] And He said: "Which of you has this surah increased in faith? Indeed, those who have believed, their faith has increased." [سورة التوبه: 124] And He said: "The hypocrites said to the believers: 'Indeed, the people have gathered against you, so fear them.' But it only increased them in faith, and they said: «حسبنا الله و نعم الوكيل» ." [سورة آل عمران: 173] And He said: "It increased them in nothing except faith and submission." [سورة الاحزاب: 22] And in the hadith it is mentioned that loving for the sake of Allah and hating for the sake of Allah is part of faith (narrated by Abu Dawud from Abu Umamah). And the caliph Umar ibn Abd al-Aziz, may Allah have mercy on him, wrote to Adi ibn Adi that faith consists of many obligations, beliefs, limits, and recommended and sunnah matters, all of which are included in faith. So whoever fulfills all of them has perfected his faith, and whoever does not fully observe them nor fulfill them has not perfected his faith. So if I remain alive, I will explain all of them to you in detail so that you may act upon them, and if I die, then I have no desire to remain in your company.

And the saying of Ibrahim (peace be upon him) has been mentioned in the Noble Qur’an:“But I wish that my heart may be satisfied.”And Mu’adh (may Allah be pleased with him) once said to a companion (named Aswad bin Bilal):“Sit with us so that for a while we may discuss matters of faith.”And Abdullah bin Mas’ud (may Allah be pleased with him) said:“Certainty is complete faith”(and patience is half of faith. Narrated by al-Tabarani). And the saying of Abdullah bin Umar (may Allah be pleased with them both) is:“A servant does not reach the true reality of piety until he leaves what causes doubt in his heart.”And Mujahid (may Allah have mercy on him), in the explanation of the noble verse «شرع لکم من الدين» etc., said:“(He has ordained for you the same religion which He ordained for Nuh) means: O Muhammad! We have enjoined upon you and Nuh the same religion.”And Abdullah bin Abbas (may Allah be pleased with them both), regarding the noble verse «شرعة ومنهاجا‏» , said:“By this is meant «سبيل» (the straight path) and the Sunnah (the good way).”

And regarding the word «دعاؤكم» in the verse of Surah Al-Furqan, it is said that «ايمانکم» by this your faith is meant.

Narrated Ibn 'Umar: Allah's Apostle said: Islam is based on (the following) five (principles): 1. To testify that none has the right to be worshipped but Allah and Muhammad is Allah's Apostle. 2. To offer the (compulsory congregational) prayers dutifully and perfectly. 3. To pay Zakat (i.e. obligatory charity) . 4. To perform Hajj. (i.e. Pilgrimage to Mecca) 5. To observe fast during the month of Ramadan.

And the explanation of Allah the Exalted’s statement:“Righteousness is not that you turn your faces towards the east or the west, but true righteousness is of the one who believes in Allah (His essence and attributes), and believes in the Last Day, and in the existence of the angels, and affirms the Book sent down from the sky, and believes as true all the prophets and messengers who came into the world. And that person gives wealth, out of love for Allah, to his (needy) relatives, and to (destitute) orphans, and to other needy people, and to (stranded) travelers, and to (those compelled) who ask, and for freeing (captives and slaves), and establishes prayer, and gives zakat, and those who fulfill their promises when they make a promise. And those who are patient and grateful in poverty, and in illness, and in (the battlefield of) jihad—these are the ones who can be called true believers, and these are indeed the pious. Certainly, the believers have succeeded: those who are humble in their prayers, and those who avoid vain talk, and those who seek purification through zakat, and those who guard their private parts except with their wives or those whom their right hands possess, for with them there is no blame. But whoever seeks beyond that (through adultery, sodomy, or masturbation, etc.), such are the transgressors. And those who are mindful of their trusts and covenants, and those who strictly guard their prayers—these are the ones who will inherit Paradise al-Firdaus, wherein they will abide forever.

Narrated Abu Huraira: The Prophet said, "Faith (Belief) consists of more than sixty branches (i.e. parts). And Haya (This term "Haya" covers a large number of concepts which are to be taken together; amongst them are self respect, modesty, bashfulness, and scruple, etc.) is a part of faith."

Narrated 'Abdullah bin 'Amr: The Prophet said, "A Muslim is the one who avoids harming Muslims with his tongue and hands. And a Muhajir (emigrant) is the one who gives up (abandons) all what Allah has forbidden."

Narrated Abu Musa: Some people asked Allah's Apostle, "Whose Islam is the best? i.e. (Who is a very good Muslim)?" He replied, "One who avoids harming the Muslims with his tongue and hands."

Narrated 'Abdullah bin 'Amr: A man asked the Prophet , "What sort of deeds or (what qualities of) Islam are good?" The Prophet replied, 'To feed (the poor) and greet those whom you know and those whom you do not Know (See Hadith No. 27).

Narrated Anas: The Prophet said, "None of you will have faith till he wishes for his (Muslim) brother what he likes for himself."