Encyclopedia of Prophetic Hadiths

"No Muslim invokes Allah with a supplication that does not involve sin or severing ties of kinship, except that Allah will grant him one of three: either His supplication will be answered soon, or He will save it for him in the Hereafter, or He will avert from him an equivalent amount of evil." They said: Then we should do more. He said: "Allah is even more."

Gabriel came to the Prophet (may Allah's peace and blessings be upon him) and said: O Muhammad, have you fallen ill? He said: "Yes." So Gabriel said: " Bismillāhi arqīk, min kulli shay’in yu’dhīk, min sharri kulli nafsin aw ‘aynin hāsidin, Allāhu yashfīk, bismillāhi arqīk (In the Name of Allah, I recite a prayer (Ruqyah) over you, from everything that harms you, from the evil of every soul or the eye of an envier. May Allah cure you. In the Name of Allah, I recite a prayer (Ruqyah) over you)."

The Messenger of Allah (ﷺ) once observed I‘tikāf (seclusion for worship) in the mosque, and he heard them reciting (the Qur’an) aloud. He lifted the curtain and said: "Indeed, each of you is conversing privately with his Lord, so let not one of you harm another, and let none of you raise his voice above another in recitation," or he said: "in prayer."