The Prophet (ﷺ) said, "When the Imam says 'Amin', then you should all say 'Amin', for the angels say 'Amin' at that time, and he whose 'Amin' coincides with the 'Amin' of the angels, all his past sins will be forgiven."
Sahih al-Bukhari Book 80, Hadith 97
← Previous Hadith `Aisha said, "The Jews came to the Prophet (ﷺ) and said to him, "As-Samu 'Alaika (i.e., Death be upon you)." He replied, 'The same on you.' " `Aisha said to them, "Death be upon you, and may Allah curse you and shower His wrath upon you!" Allah's Messenger (ﷺ) I said, "Be gentle and calm, O `Aisha! Be gentle and beware of being harsh and of saying evil things." She said, "Didn't you hear what they said?" He said, "Didn't you hear what I replied (to them)? have returned their statement to them, and my invocation against them will be accepted but theirs against me will not be accepted."

Sahih al-Bukhari Book 80, Hadith 96 Next Hadith → Allah's Messenger (ﷺ) said," Whoever says: "La ilaha illal-lah wahdahu la sharika lahu, lahu-l-mulk wa lahul- hamd wa huwa 'ala kulli shai'in qadir," one hundred times will get the same reward as given for manumitting ten slaves; and one hundred good deeds will be written in his accounts, and one hundred sins will be deducted from his accounts, and it (his saying) will be a shield for him from Satan on that day till night, and nobody will be able to do a better deed except the one who does more than he."

Sahih al-Bukhari Book 80, Hadith 98