Explanation

• The first revelation of the Holy Quran consisted of 5 Aayats.
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• Related questions about the revelation of the Holy Quran:
• 2 years and six months was the interval between the first and the second revelation of the Holy Quran
• 1st revelation of Muhammad was made in Hira. On 17 Ramzan 610 AD 
• 23 years did it take for the complete revelation of the Quran
• Prophet (SAW) used to meditate on Mount Hira before revelation.
• According to Islamic Calendar, on the 21st of Ramadan the prophet Muhammad(PBUH) received the first revelations of the Quran
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• The Quran was verbally revealed from God to Muhammad through the angel Gabriel beginning on 22 December 609 CE,
• when Muhammad was 40 and concluding in 632 CE, the year of his death.