Narrated Abu Sa`id:
Some of the companions of the Prophet (ﷺ) went on a journey till they reached some of the 'Arab tribes (at night). They asked the latter to treat them as their guests but they refused. The chief of that tribe was then bitten by a snake (or stung by a scorpion) and they tried their best to cure him but in vain. Some of them said (to the others), "Nothing has benefited him, will you go to the people who resided here at night, it may be that some of them might possess something (as treatment)," They went to the group of the companions (of the Prophet (ﷺ) ) and said, "Our chief has been bitten by a snake (or stung by a scorpion) and we have tried everything but he has not benefited. Have you got anything (useful)?" One of them replied, "Yes, by Allah! I can recite a Ruqya, but as you have refused to accept us as your guests, I will not recite the Ruqya for you unless you fix for us some wages for it." They agrees to pay them a flock of sheep. One of them then went and recited (Surat-ul-Fatiha): 'All the praises are for the Lord of the Worlds' and puffed over the chief who became all right as if he was released from a chain, and got up and started walking, showing no signs of sickness. They paid them what they agreed to pay. Some of them (i.e. the companions) then suggested to divide their earnings among themselves, but the one who performed the recitation said, "Do not divide them till we go to the Prophet (ﷺ) and narrate the whole story to him, and wait for his order." So, they went to Allah's Messenger (ﷺ) and narrated the story. Allah's Messenger (ﷺ) asked, "How did you come to know that Suratul- Fatiha was recited as Ruqya?" Then he added, "You have done the right thing. Divide (what you have earned) and assign a share for me as well." The Prophet (ﷺ) smiled thereupon.
Narrated Abu Sa`id:
A group of the companions of Allah's Messenger (ﷺ) proceeded on a journey till they dismounted near one of the Arab tribes and requested them to entertain them as their guests, but they (the tribe people) refused to entertain them. Then the chief of that tribe was bitten by a snake (or stung by a scorpion) and he was given all sorts of treatment, but all in vain. Some of them said, "Will you go to the group (those travelers) who have dismounted near you and see if one of them has something useful?" They came to them and said, "O the group! Our leader has been bitten by a snake (or stung by a scorpion) and we have treated him with everything but nothing benefited him Has anyone of you anything useful?" One of them replied, "Yes, by Allah, I know how to treat with a Ruqya. But. by Allah, we wanted you to receive us as your guests but you refused. I will not treat your patient with a Ruqya till you fix for us something as wages." Consequently they agreed to give those travellers a flock of sheep. The man went with them (the people of the tribe) and started spitting (on the bite) and reciting Surat-al-Fatiha till the patient was healed and started walking as if he had not been sick. When the tribe people paid them their wages they had agreed upon, some of them (the Prophet's companions) said, "Distribute (the sheep)." But the one who treated with the Ruqya said, "Do not do that till we go to Allah's Apostle and mention to him what has happened, and see what he will order us." So they came to Allah's Messenger (ﷺ) and mentioned the story to him and he said, "How do you know that Surat-al-Fatiha is a Ruqya? You have done the right thing. Divide (what you have got) and assign for me a share with you."
Abu Huraira reported: The Messenger of Allah (ﷺ) said: If anyone observes prayer in which he does not recite Umm al-Qur'an, It is deficient [he said this three times] and not complete. It was said to Abu Huraira: At times we are behind the Imam. He said: Recite it inwardly, for he had heard the Messenger of Allah (ﷺ) declare that Allah the Exalted had said: I have divided the prayer into two halves between Me and My servant, and My servant will receive what he asks. When the servant says: Praise be to Allah, the Lord of the universe, Allah the Most High says: My servant has praised Me. And when he (the servant) says: The Most Compassionate, the Merciful, Allah the Most High says: My servant has lauded Me. And when he (the servant) says: Master of the Day of judg- ment, He remarks: My servant has glorified Me. and sometimes He would say: My servant entrusted (his affairs) to Me. And when he (the worshipper) says: Thee do we worship and of Thee do we ask help, He (Allah) says: This is between Me and My servant, and My servant will receive what he asks for. Then, when he (the worshipper) says: Guide us to the straight path, the path of those to whom Thou hast been Gracious not of those who have incurred Thy displeasure, nor of those who have gone astray, He (Allah) says: This is for My servant, and My servant will receive what he asks for. Sufyan said: 'Ala b. 'Abd al-Rahman b. Ya'qub narrated it to me when I went to him and he was confined to his home on account of illness, and I asked him about it.
Anas reported: I observed prayer along with the Messenger of Allah (ﷺ) and with Abu Bakr, Umar and Uthman (may Allah be pleased with all of them), but I never heard any one of them reciting Bismillah-ir-Rahman-ir-Rahim loudly.