I accompanied the Prophet ﷺ on a journey. One day I was near him while we were moving so I said: "O Messenger of Allah! Inform me about an action by which I will be admitted into Paradise, and which will keep me far from the Fire." He said: "You have asked me about something great, but it is easy for whomever Allah makes it easy: (1) Worship Allah and do not associate any partners with Him, (2) establish the Salah, (3) give the Zakat, (4) fast Ramadan and, (5) perform Hajj to the House.'
Then he ﷺ said: "Shall I not guide you to the doors of good? (1) Fasting is a shield, and (2) charity extinguishes sins like water extinguishes fire, and (3) a person's prayer in depths of the night." Then he ﷺ recited: "Their sides forsake their beds to call upon their Lord..." until he reached "what they used to do." [Sajdah 32:16-17]
Then he ﷺ said: "Shall I not inform you about the head of the entire matter, and its pillar, and its hump?" I said: "Of course, O Messenger of Allah!" He ﷺ said: "The head of the matter is Islam, and its pillar is the Salah, and its hump is Jihad."
Then he ﷺ said: "Shall I not inform you about what governs all of that?" I said: "Of course, O Messenger of Allah!" So he ﷺ grabbed his tongue and he said: "Restrain this." I said: "O Prophet of Allah! Will we be taken to account for what we say?" He said: "May your mother grieve your loss O Muadh! Are the people not tossed into the Hellfire upon their faces," or "upon their noses, except because of what their tongues have wrought?"