49:3Al-Hujuraat

"Allah and His angels say salah upon the front rows, and the Mu'adhdhin will be forgiven as far as his voice reaches, and whatever hears him, wet or dry, will confirm what he says, and he will have a reward like that of those who pray with him."

"The Messenger of Allah said: 'Allah, the Mighty and Sublime, has forgiven my Ummah for what is whispered to them or what enters their minds, so long as they do not act upon it or speak of it.'"

The Prophet (ﷺ) said, "Allah has accepted my invocation to forgive what whispers in the hearts of my followers, unless they put it to action or utter it." (See Hadith No. 657 Vol. 8)

“The Messenger of Allah (ﷺ) said: ‘Among the people who recite the Qur’an with the most beautiful voices is the man who, when you hear him, you think that he fears Allah.’”

Two person of Bani Thaqif and one from Quarish (or two persons from Quraish and one from Bani Thaqif) who had fat bellies but little wisdom, met near the Ka`ba. One of them said, "Did you see that Allah hears what we say? " The other said, "He hears us if we speak aloud, but He does not hear if we speak in stealthy quietness (softly)." The third fellow said, "If He hears when we speak aloud, then He surely hears us if we speak in stealthy quietness (softly)." So Allah revealed the Verse:-- 'And you have not been screening against yourselves, lest your ears, and your eyes and your skins should testify against you..." (41.22)