The three monotheistic religions, so called Abrahamic faith, Judaism, Christianity and Islam share similarities in terms of their geographical origin and their confession of faith. On the one hand the Islamic creed Shahadah and the Jewish declaration of faith Shema` have things in common, but on the other hand they reveal distinctive features of their own. The present study compares the confession formulae between Shahadah and Shema` which appear in their Scriptures, Qur`an and Miqra`. The examination of the written sources shows that there should have been literary contacts between them direct or indirect. It is very likely that the Islamic creed Shahadah came under the influence of the Jewish Shema` in terms of formula and idea. At the same time, however, Shahadah demonstrates its own features which are absent in Shema`. And these demand further study in the subject.