Some Ans. Questions 2014 by -'Abdu'l-Bahá- 1 Para

Briefly, Muhammad appeared in the desert of Hijaz in the Arabian Peninsula, which was a treeless and barren wilderness: sandy, desolate in the extreme, and in some places, such as Mecca and Medina, exceedingly hot. Its inhabitants were nomads, had the morals and manners of desert-dwellers, and were entirely bereft of knowledge and learning. Even Muhammad Himself was illiterate, and the Qur'an was originally written upon the blade-bones of sheep or on palm leaves. Infer then from this the conditions prevailing among the people to whom Muhammad was sent! (7:11)

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