Sahih al-Bukhari Book 65, Hadith 298
When there was revealed: 'It is those who believe and confuse not their beliefs with wrong.' (6.82) It
was very hard for the companions of Allah's Messenger (ﷺ), so they said, "Which of us has not confused his
belief with wrong?" Allah's Messenger (ﷺ) said, "The Verse does not mean this. Don't you hear Luqman's
statement to his son: 'Verily! Joining others in worship, with Allah is a great wrong indeed.' (31.13)
Allah's Messenger (ﷺ) said, "No child is born except on Al-Fitra (Islam) and then his parents make him Jewish, Christian or Magian, as an animal produces a perfect young animal: do you see any part of its body amputated?" Then he rec 'The religion of pure Islamic Faith (Hanifa),(i.e. to worship none but Allah), The pure Allah's Islamic nature with which He (Allah) has created mankind. Let There be no change in Allah's religion (i.e. to join none in Allah's worship). That is the straight religion; but most of men know not..." (30.30)
One day while Allah's Messenger (ﷺ) was sitting with the people, a man came to him walking and said, "O Allah's Messenger (ﷺ). What is Belief?" The Prophet (ﷺ) said, "Belief is to believe in Allah, His Angels, His Books, His Apostles, and the meeting with Him, and to believe in the Resurrection." The man asked, "O Allah's Messenger (ﷺ) What is Islam?" The Prophet (ﷺ) replied, "Islam is to worship Allah and not worship anything besides Him, to offer prayers perfectly, to pay the (compulsory) charity i.e. Zakat and to fast the month of Ramadan." The man again asked, "O Allah's Messenger (ﷺ) What is Ihsan (i.e. perfection or Benevolence)?" The Prophet (ﷺ) said, "Ihsan is to worship Allah as if you see Him, and if you do not achieve this state of devotion, then (take it for granted that) Allah sees you." The man further asked, "O Allah's Messenger (ﷺ) When will the Hour be established?" The Prophet (ﷺ) replied, "The one who is asked about it does not know more than the questioner does, but I will describe to you its portents. When the lady slave gives birth to her mistress, that will be of its portents; when the bare-footed naked people become the chiefs of the people, that will be of its portents. The Hour is one of five things which nobody knows except Allah. Verily, the knowledge of the Hour is with Allah (alone). He sends down the rain, and knows that which is in the wombs." (31.34) Then the man left. The Prophet (ﷺ) said, "Call him back to me." They went to call him back but could not see him. The Prophet (ﷺ) said, "That was Gabriel who came to teach the people their religion." (See Hadith No. 47 Vol 1)