What are the six pillars of iman (faith)?

From the Hadith of Jibreel (Sahih Muslim 8) where the Angel Jibreel asked the Prophet ﷺ to define iman.

1. Belief in Allah: His existence, oneness (tawheed), unique attributes. The three categories: Rububiyyah (lordship), Uluhiyyah (worship), Asma wa Sifat (names and attributes).

2. Belief in the Angels: Created from light, sinless, always obeying Allah. Major angels: Jibreel (revelation), Mikail (rain/sustenance), Israfil (the trumpet), Malak al-Mawt (death), Munkar and Nakir (questioning in the grave). Each person has guardian and recording angels (Quran 50:17-18).

3. Belief in the Revealed Books: The Quran is Allah's final preserved word. Belief in the originals: Tawrat (Moses), Zabur (David), Injeel (Jesus), and the scrolls of Ibrahim — though the originals are not preserved in their pure form today. The Quran confirms what was revealed before in its true form.

4. Belief in the Messengers: 25 are named in the Quran, including Adam, Nuh, Ibrahim, Musa, Isa, and Muhammad ﷺ. Muhammad ﷺ is the final messenger (Quran 33:40). All true prophets brought the same core message: worship Allah alone.

5. Belief in the Last Day: Death, the grave, resurrection, judgment, the Sirat (bridge), and eternal Paradise or Hell. Knowing the signs (minor and major) of the Day.

6. Belief in Qadar: Allah's complete knowledge and will encompass all things. He has written the destinies of all creation. Levels: His knowledge, His writing in al-Lawh al-Mahfooz, His will, His creation. This does NOT remove free will — humans choose and are accountable. Brings peace: nothing happens except by Allah's permission.

Denial of any pillar takes one out of Islam.