Abu Huraira reported God’s messenger as saying, “The Qur’an came down showing five aspects: what is permissible, what is prohibited, what is firmly fixed, what is obscure, and parables. So treat what is permissible as permissible and what is prohibited as prohibited, act upon what is firmly fixed; believe in what is obscure, and take a lesson from the parables.” This is the wording in Al-masabih. Baihaqi transmitted it in Shu’ab al-iman, his wording being, “Act according to what is permissible, avoid what is prohibited, and follow what is firmly fixed.”

Mu'adh b. Jabal reported God’s messenger as saying, “The devil is a wolf to man, like the wolf which harries sheep, catching the one which is solitary, the one which stays far from the flock, and the one which wanders. So avoid the branching paths and keep to the general community.” Ahmad transmitted it.

Abu Dharr reported God’s messenger as saying, “He who separates himself a handbreadth from the community has cast off the rope of Islam from his neck.” Ahmad and Abu Dawud transmitted it.

Malik b. Anas, in mursal form, reported God’s messenger as saying, “As long as you hold fast to two things which I have left among you, you will not go astray: God’s Book and His messenger’s sunna” He transmitted it in Al-Muwatta.

Hassan said that no people had produced an innovation in their religion without God removing an equivalent amount from their sunna, then not restoring it to them till the day of resurrection. Darimi transmitted it.

Ibrahim b. Maisara reported God’s messenger as saying, “He who honours an innovator has assisted in undermining Islam.” Baihaqi transmitted it in mursal form in Shu'ab al-iman.

Ibn Mas'ud said, ‘If anyone follows someone’s custom let him follow the custom of one who is dead, for one cannot be sure of the living not being led astray. Those to follow are Muhammad’s Companions who were the most excellent among the people, purest in heart, most profound in knowledge, most unassuming, whom God chose for companionship with His Prophet and to establish His religion. So recognise their excellence, follow their traces, and hold as fast as you can to their character and way of life, for they followed right guidance.” Razin transmitted it.

He also reported God's messenger as saying, “My words do not abrogate God’s words, but God’s words abrogate mine, some of His words abrogate others.” Daraqutni transmitted it.

Ibn ‘Umar reported God’s messenger as saying, “Some of my traditions abrogate others just as some parts of the Qur’an abrogate others.” Daraqutni transmitted it.

Abu Tha'laba al-Khushani reported God’s messenger as saying, “God has made certain things binding, so do not cause them to be lost; He has prohibited certain things, so do not violate them; He has fixed certain limits, so do not transgress them; and He, without being forgetful, has said nothing about certain things, so do not search into them.” Daraqutni transmitted it.

Abu Huraira transmitted it with a difference containing the following: When you see the barefooted, the naked, the deaf, the dumb as kings of the earth, as -well as five things which no one but God knows. Then he recited, ‘‘God has knowledge of the Hour, and He sends down the rain…” (Bukhari and Muslim.)

Ibn ‘Umar reported God's messenger as saying, “Islam is based on five things: the testimony that there is no god but God and that Muhammad is His servant and messenger, the observance of the prayer, the payment of zakat, the Pilgrimage, and the fast during Ramadan.” (Bukhari and Muslim.)

Abu Huraira reported God’s messenger as saying, “Faith has over seventy branches, the most excellent of which is the declaration that there is no god but God, and the humblest of which is the removal of what is injurious from the road. And modesty is a branch of faith.” (Bukhari and Muslim.)

Anas reported God’s messenger as saying, “None of you believes till I am dearer to him than his father, his child, and all mankind.” (Bukhari and Muslim).

He also reported God’s messenger as saying, “There are three qualities for which anyone who is characterised by them will experience the sweetness of faith: he to whom God and His messenger are dearer than all else; he who loves a human being for God’s sake alone; and he who has as great an abhorrence of returning to unbelief after God has rescued him from it as he has of being cast into hell.” (Bukhari and Muslim.)

Abu Musa al-Ash‘ari reported God’s messenger as saying, "Three types will have a double reward: one of the people of the Book who believes in his prophet and believes in Muhammad; a slave when he fulfils what is due to God and what is due to his patrons; and a man who has a slavegirl with whom he has intercourse, who gives her a good training in manners and a good education, then sets her free and marries her—he will have a double reward.” (Bukhari and Muslim.)

Ibn ‘Umar reported God’s messenger as saying, "I am commanded to fight with men till they testify that there is no god but God and that Muhammad is God's messenger, observe the prayer and pay the zakat. When they do that they will keep their lives and their property safe from me, except for what is due to Islam; and their reckoning will be at God’s hands.” (Bukhari and Muslim, but Muslim did not mention, "except for what is due to Islam”.)

Abu Huraira reported that an Arab came to the Prophet (ﷺ) and said, "Guide me to a deed by doing which I shall enter paradise.” He said, “Worship God and associate nothing with Him, observe the prescribed prayer, pay the obligatory zakat, and fast during Ramadan.” He replied, "By Him in whose hand my soul is, I shall not add anything to this, or fall short of it.” Then when he turned away the Prophet (ﷺ) said, "If anyone wishes to look at a man who will be among the people of paradise, let him look at this man.” (Bukhari and Muslim.)

Sufyan b. ‘Abdallah ath-Thaqafi reported that he said, "Messenger of God, say something about Islam concerning which I shall need to ask no one after you are gone.” (A version has "anyone else”.) He said, "Say, ‘I believe in God’, then keep to the straight path.” Muslim transmitted it.

Talha b. ‘Ubaidallah said: A man of the people of Najd with dishevelled hair came to God’s messenger. We could hear the sound of his voice, but could not understand what he was saying till he came near God’s messenger and we realised that he was asking about Islam. God’s messenger said, “Five times of prayer each day and night.” He asked, “Must I observe any more than them?” He replied, “No, unless you do it voluntarily.” God's messenger said, “And fasting during the month of Ramadan.” He asked, “Must I observe anything else?” He replied, “No, unless you do it voluntarily.” Talha said that God's messenger mentioned the zakat to him, and he asked, “Must I pay anything else?” He replied, “No, unless you do it voluntarily.” He said that the man turned away saying, “I swear by God that I shall not add anything to this or fall short of it.” So God’s messenger said, “The man will prosper if he is speaking the truth.” (Bukhari and Muslim.)