Quote Originally Posted by pajerokid View Post
[Middle English testifien, from Latin testificamacr.gifrimacr.gif : testis, witness; see trei- in Indo-European roots + -ficamacr.gifrimacr.gif, -fy.]

I think the latin TESTIS got confused with the modern TESTES.

but it is a fact that during those days taking an oath means one must put his hand under the scrotum of the other person.

are the testis and the modern testes you're pointing out here are different from:
>>> testis = testicle
>>> testes = testicles.