He reveals Himself through His chosen servants. In speaking to Holy Prophet Muhammad (peace and the blessings of Allah be upon him), He says:

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Surely, We have sent revelation to thee, as We sent revelation to Noah and the Prophets after him; and We sent revelation to Abraham and Ishmael and Isaac and Jacob and his children, and to Jesus and Job and Jonah and Aaron and Solomon, and We gave David a Book. (4:164)

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And We sent some Messengers whom We have already mentioned to thee and some Messengers whom We have not mentioned to thee – and to Moses Allah spoke at great length. (4:165)

The Holy Quran only mentions 24 Prophets by name, but according to a saying of Holy Prophet Muhammad (peace and the blessings of Allah be upon him), 124,000 Prophets have appeared in the world. Some of them are described in the category ‘Prophets’.