Final answer:
Muhammad is the messenger who received the revelations of the Quran from God through the angel Gabriel. The lessons being communicated to believers include the importance of unity, guidance, and recognizing signs of God's presence.
Step-by-step explanation:
The messenger referenced here is Muhammad, who received the revelations of the Quran from God through the intermediary of the angel Gabriel. Muhammad was the recipient of the divine message and his goal on earth was to preach Islam and guide humanity towards salvation.
The lessons being communicated to believers in this reading include the emphasis on God's unity and transcendence, the importance of following the guidance of the messenger, and the need to recognize the signs of God's presence.
The references to Moses and Cain and Abel in the Quran may indicate that its early audience was familiar with the stories from the Bible and other religious traditions, and these references serve to highlight the continuity and universal nature of the message being conveyed.