Humran Ibn A’yan reported that Imam As-Sadiq (a.) said: “Islam is that, to which one outwardly (Zahir) confessed in word and action and this is the case with the community of the people from all groups and therefore their blood is under protection and on this basis the inheritances (Irth) and the union (Nikah) is valid.” [Al-Hada’iq of Al-Bahrani, Volume 24 page 68 Hadith 1]

عن حمران بن أعين عن أبي عبد الله عليه السلام أنه قال: والإسلام ما ظهر من قول أو فعل وهو الذي عليه جماعة الناس من الفرق كلها وبه حقنت الدماء وعليه جرت المواريث وجاز النكاح

Sama’ah Ibn Mihran reported that Imam As-Sadiq (a.) said: “Islam is the confession (Shahadah) that there is no god but God and that Muhammad (s.) is the messenger of God and through this their blood is put under protection and on this basis the unions (Nikah) and the inheritances (Irth) are made and to this belongs outwardly (Zahir) the generality of people.” [Al-Hada’iq of Al-Bahrani, Volume 24 page 68 Hadith 2]

عن سماعة عن أبي عبد الله عليه السلام أنه قال: الاسلام شهادة أن لا إله إلا الله والتصديق برسول الله صلى الله عليه وآله وبه حقنت الدماء وعليه جرت المناكح والمواريث وعلى ظاهره عامة الناس