كان ابن عمر، §إذا دعا طبيبا يعالج بعض أصحابه اشترط عليه أن لا يداوي بشيء مما حرم الله عز وجل
It has been attributed to Saydna Abdullah ibn Umar رضیﷲ عنه that whenever he asked the doctor for prescription, he place a condition that he won't treat his disease or illness with the things which Allah had forbidden.
[al Mustadrak ala Sahihayn #7510]
via Saifullah Muhammadi
