The Ruling on Praying Without Adhan or Iqamah and Writing Verses for Ruqyah

Question:
What is the ruling on those who prayed without adhan or iqamah? Is adhan obligatory, and is iqamah? Because Shaykh al-Islam Ibn Taymiyyah said: If it is established in a town, it drops off the rest. And what is the ruling on the azimahs that contain saffron which the patient drinks, and so on?

Answer:
Adhan and iqamah are a collective obligation. If they are in a village or a city, they must call the adhan and establish the iqamah. Likewise, in travel, they must call the adhan and establish the iqamah if there is one mosque; then one adhan. If there are two mosques, two adhans; three, three, and so on according to the number of mosques. Iqamah is a collective obligation; if the mu'adhdhin or someone else establishes it, that suffices. If they prayed and did not call the adhan and did not establish the iqamah, their prayer is valid, but they sin by leaving off the adhan and iqamah. They have made a mistake, and their prayer is valid, because this is an obligation outside the prayer, so leaving it off does not harm the prayer in terms of its validity. Rather, their prayer is valid, and they are sinful, and they must repent, seek forgiveness, and not return to leaving off the adhan and iqamah.
Likewise, writing Qur'anic verses and supplications with saffron in a container or on papers, then washing it and drinking it, is permissible. Many of the Salaf did this. However, it is better and more complete if it is recited over the patient, or blown upon the patient's hand or leg, or in water that he drinks.