assalam-o-alaikum in a bayan i heard that if we read sure faiha 70 times aytal kursi 70 time sure ikhlas 70 time sure falaq 70 time and suray naas 70 time and blow it on rain water and give it to an ill person to drink and do this amal for 7 days will cure every illness even cancer. and Allah said he would take out even all the illness hidden in the bones by this amal. is this amal true?
Yes, it is right. You shall receive benefit as much as you recite it with ikhlas.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband