Difference Islam & Iman?

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The point is that when either word, iman or Islam , is used alone, there is no difference between them, rather each of them when used alone refers to the entire religion.

If there is any difference between them, then the word:

Islam refers to outward physical actions and the word iman refers to inward actions of the heart.

This is what is indicated by the hadith of Jibreel which was narrated by Muslim in his Sahih (8) from ‘Umar ibn al-Khattab who said:

One day when we were with the Messenger of Allah (peace and blessings of Allah be upon him), there appeared before us a man whose clothes were exceedingly white and his hair was exceedingly black, and there were no signs of travel on him. No one among us recognized him. He came and sat down by the Prophet (peace and blessings of Allah be upon him) and rested his knees against his and placed the palms on his hands on his thighs.

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He said: “O Muhammad, tell me about Islam.” The Messenger of Allah (peace and blessings of Allah be upon him) said: “Islam is to testify that there is none worthy of worship except Allah and that Muhammad is the Messenger of Allah, to establish regular prayer, to pay zakah, to fast Ramadan and to go on pilgrimage to the House if you are able to.” He said: “You have spoke the truth.” And we were amazed at his asking that and saying that he had spoken the truth. Then he said: “Tell me about iman (faith, belief),” He said: “It means believing in Allah, His angels, His Books, His Messengers, and the Last Day, and believing in al-qadar (the divine will and decree), both good and bad.” He said: “You have spoken the truth.”

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He said: “Tell me about ihsan.” He said: “It means worshipping Allah as if you can see Him, and although you cannot see Him, He can see you.” He said: “Tell me about the Hour.” He said: “The one who is being asked does not know more about it than the one who is asking.” He said: “Then tell me about its signs.” He said: “The slave-girl will give birth to her mistress, and you will see the barefoot, naked, destitute herdsmen competing in constructing lofty buildings.” Then he departed and I stayed for a while. Then he said to me: “O ‘Umar, do you know who the questioner was?” I said: “Allah and His Messenger know best.” He said: “That was Jibreel, who came to teach you your religion.”