[2/93] al-Faqih and al-Tahdhib: From Ibn Mahbub from Abdallah b. Sinan who said: Abu Abdillah عليه السلام said: everything which has both Halal and Haram [elements mixed into it] then it is Halal for you forever until you know the Haram in it specifically so you abandon it.

[2/93] الفقيه والتهذيب: عن ابن محبوب عن عبدالله بن سنان قال: قال ابوعبدالله عليه السلام: كل شئ يكون فيه حرام وحلال فهو لك حلال ابدا حتى تعرف الحرام منه بعينه فتدعه