Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "When the Imam says Ameen, you should also say Ameen, for (at that time) the angels also say Ameen, and whoever's Ameen coincides with the Ameen of the angels, his previous sins will be forgiven."

It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him), he states that the Messenger of Allah (peace and blessings be upon him) said: "When the Imam says «غير المغضوب عليهم ولا الضالين» and says Ameen, then you should also say Ameen, because the angels also say Ameen upon the Imam's supplication, and whoever's Ameen coincides with the Ameen of the angels, his previous sins will be forgiven."

It is narrated from Sayyiduna Anas (may Allah be pleased with him), he says that the Messenger of Allah (peace and blessings of Allah be upon him) said: "The Jews envy you for two qualities: saying Salam and saying Ameen."

Lady Aisha (may Allah be pleased with her) narrates that a Jew came to the Messenger of Allah (peace and blessings be upon him) and said (instead of "As-salamu Alaikum"): O Muhammad! «اَلسَّامُ عَليكم» (meaning: death and destruction be upon you). The Prophet (peace and blessings be upon him) replied: «وعليك» (and upon you too). Lady Aisha (may Allah be pleased with her) says: I wanted to say something, but I knew that the Prophet (peace and blessings be upon him) would dislike it, so I remained silent. Another Jew came and said: «اَلسَّامُ عَليكم» (death and destruction be upon you). The Prophet (peace and blessings be upon him) said: "«وعليك» (and upon you too)." This time as well, I wanted to say something, but due to the Prophet's (peace and blessings be upon him) dislike, I remained silent. Then a third Jew came and said: «اَلسَّامُ عَليكم» I could not remain patient and I spoke out: O apes and swine! Destruction be upon you, and the wrath of Allah and His curse. Do you want to adopt the manner in which Allah Almighty has not sent peace upon the Messenger of Allah (peace and blessings be upon him)? The Messenger of Allah (peace and blessings be upon him) said: "Allah Almighty does not like foul language and obscenity. They (the Jews) said «اَلسَّامُ عَليكم» and we also (avoiding foul language, by only saying «وعليك») replied. In fact, the Jews are a jealous people, and they do not envy us for any trait as much as they envy us for Salam and Ameen."