In Islam, a boy is considered to have reached puberty primarily when he experiences his first wet dream (nocturnal emission). Alternatively, if this doesn't occur, puberty is recognized when he reaches 15 lunar years of age.
Here's a breakdown:
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Wet Dream (Nocturnal Emission): This is the primary physical sign indicating the start of puberty for boys in Islamic jurisprudence.
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Age of Fifteen Lunar Years: If a boy doesn't experience a wet dream by the age of 15 lunar years, he is then considered to have reached puberty. A lunar year is approximately 354 days, making 15 lunar years roughly equivalent to 14 years and 6 months in solar years.
Essentially, either the physical sign of a wet dream or reaching the age of 15 lunar years marks the onset of puberty for boys in Islamic terms, making them accountable for religious obligations.