It is remarkable that circumcision, which is invariably practiced by thE Mahometans, and forms a distinguishing rite of their faith, to which all pro… - Washington Irving

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It is remarkable that circumcision, which is invariably practiced by thE
Mahometans, and forms a distinguishing rite of their faith, to which all
proselytes must conform, is neither mentioned in the Koran nor the
Sonna. It seems to have been a general usage in Arabia, tacitly adopted
from the Jews, and is even said to have been prevalent throughout the
East before the time of Moses.

It is said that the Koran forbids the making likenesses of any living
thing, which has prevented the introduction of portrait-painting among
Mahometans. The passage of the Koran, however, which is thought to
contain the prohibition, seems merely an echo of the second commandment, held sacred by Jews and Christians, not to form images or pictures
for worship. One of Mahomet's standards was a black eagle. Among the most distinguished Moslem ornaments of the Alhambra at Granada is a fountain supported by lions carved of stone, and some Moslem monarchs have had their effigies stamped on their coins.