Isnād is the chain by which a text reaches you.
Isnad Press publishes classical Arabic works in English.
The Explanation of the Ḥadīth of Abū Bakr al-Ṣiddīq
About the bookالإسناد من الدين، ولولا الإسناد لقال من شاء ما شاء
“The isnād is part of the religion. Were it not for the isnād, whoever wished could say whatever he wished.”
ʿAbdullāh ibn al-Mubārak, cited by Muslim in the introduction to his Ṣaḥīḥ