Final answer:
The first four leaders of Islam were the Rightly Guided Caliphs, instrumental in the early expansion of Islam.
Explanation:
The first four leaders of Islam were known as the Rightly Guided Caliphs, who oversaw the crucial early years of Islamic expansion. These four caliphs were Abu Bakr, Umar, Uthman, and Ali. They ruled between 632 and 661, playing a significant role in the spread of Islam.
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