Amāli of al-Shaykh al-Ṭūsi: With his chain, he said:

al-Ṣādiq عليه السلام said: One who is afflicted with an ailment, let him recite al-Ḥamd (i.e. al-Fātiḥa) in his heart seven times, for indeed it will depart. However, if it does not – then one should recite it seventy times; and I am the guarantor of good health for him.

أمالي الشيخ  بإسناده ، قال : قال الصادق ( عليه السلام ) : من نالته علة ، فليقرأ الحمد في جيبه سبع مرات ، فإن ذهبت ، وإلا فليقرأها سبعين مرة ، وأنا الضامن له العافية