And if a sojourner desired to eat thereof, he should be mindful of his domestic obligations: all his males should be Circumcised along with him, and then his disabilities were at an end.
"The Expositor's Bible: The Book of Exodus"
G. A. Chadwick
This shows that circumcision was a very ancient custom among the Israelites, and at the same time indicates that among the Arabs the boys were not Circumcised till later years, which may have been the case in the older times among the Hebrews also.
"The History of Antiquity, Vol. II (of VI)"
Max Duncker
When he was a week old, he was Circumcised....
"Stories and Pictures"
Isaac Loeb Peretz