It is recommended to say Amin after finishing the recitation of Al-Fatihah. Amin means, "O Allah! Accept our invocation.'' The evidence that saying Amin is recommended is contained in what Imams Ahmad, Abu Dawud and At-Tirmidhi recorded, that Wa'il bin Hujr said, "I heard the Messenger of Allah recite,

﴿ط؛ظژظٹظ’ط±ظگ ط§ظ„ظ’ظ…ظژط؛ظ’ط¶ظڈظˆط¨ظگ ط¹ظژظ„ظژظٹظ’ظ‡ظگظ…ظ’ ظˆظژظ„ط§ظژ ط§ظ„ط¶ظ‘ظژط¢ظ„ظ‘ظگظٹظ†ظژ﴾

(Not (that) of those who earned Your anger, nor of those who went astray), and he said `Amin' extending it with his voice.''

Abu Dawud's narration added, "Raising his voice with it.'' At-Tirmidhi then commented that this Hadith is Hasan and was also narrated from `Ali and Ibn Mas`ud. Also, Abu Hurayrah narrated that whenever the Messenger of Allah would recite,

﴿ط؛ظژظٹظ’ط±ظگ ط§ظ„ظ’ظ…ظژط؛ظ’ط¶ظڈظˆط¨ظگ ط¹ظژظ„ظژظٹظ’ظ‡ظگظ…ظ’ ظˆظژظ„ط§ظژ ط§ظ„ط¶ظ‘ظژط¢ظ„ظ‘ظگظٹظ†ظژ﴾

(Not (the way) of those who earned Your anger, nor of those who went astray), He would say Amin until those who were behind him in the first line could hear him.

Abu Dawud and Ibn Majah recorded this Hadith with the addition, "Then the Masjid would shake because of (those behind the Prophet ) reciting Amin.'' Also, Ad-Daraqutni recorded this Hadith and commented that it is Hasan.

Further, Bilal narrated that he said, "O Messenger of Allah! Do not finish saying Amin before I can join you.'' This was recorded by Abu Dawud.

In addition, Abu Nasr Al-Qushayri narrated that Al-Hasan and Ja`far As-Sadiq stressed the `m' in Amin.

Saying Amin is recommended for those who are not praying (when reciting Al-Fatihah) and is strongly recommended for those who are praying, whether alone or behind the Imam. The Two Sahihs recorded that the Messenger of Allah said,

آ«ط¥ظگط°ظژط§ ط£ظژظ…ظ‘ظژظ†ظژ ط§ظ„ظ’ط¥ظگظ…ظژط§ظ…ظڈ ظپظژط£ظژظ…ظ‘ظگظ†ظڈظˆط§طŒ ظپظژط¥ظگظ†ظ‘ظژظ‡ظڈ ظ…ظژظ†ظ’ ظˆظژط§ظپظژظ‚ظژ طھظژط£ظ’ظ…ظگظٹظ†ظڈظ‡ظڈ طھظژط£ظ’ظ…ظگظٹظ†ظژ ط§ظ„ظ’ظ…ظژظ„ظژط§ط¦ظگظƒظژط©ظگ ط؛ظڈظپظگط±ظژ ظ„ظژظ‡ظڈ ظ…ظژط§ طھظژظ‚ظژط¯ظ‘ظژظ…ظژ ظ…ظگظ†ظ’ ط°ظژظ†ظ’ط¨ظگظ‡ظگآ»

(When the Imam says, ' Amin', then say, 'Amin', because whoever says, Amin' with the angels, his previous sins will be forgiven.)

Muslim recorded that the Messenger of Allah said,

آ«ط¥ظگط°ظژط§ ظ‚ظژط§ظ„ظژ ط£ظژط­ظژط¯ظڈظƒظڈظ…ظ’ ظپظگظٹ ط§ظ„طµظ‘ظژظ„ظژط§ط©ظگ: ط¢ظ…ظگظٹظ†ظژطŒ ظˆظژط§ظ„ظ’ظ…ظژظ„ظژط§ط¦ظگظƒظژط©ظڈ ظپظگظٹ ط§ظ„ط³ظ‘ظژظ…ظژط§ط،ظگ: ط¢ظ…ظگظٹظ†ظژطŒ ظپظژظˆظژط§ظپظژظ‚ظژطھظ’ ط¥ظگط­ظ’ط¯ظژط§ظ‡ظڈظ…ظژط§ ط§ظ„ظ’ط£ظڈط®ظ’ط±ظژظ‰ ط؛ظڈظپظگط±ظژ ظ„ظژظ‡ظڈ ظ…ظژط§ طھظژظ‚ظژط¯ظ‘ظژظ…ظژ ظ…ظگظ†ظ’ ط°ظژظ†ظ’ط¨ظگظ‡ظگآ»

(When any of you says in the prayer, 'Amin ` and the angels in heaven say, `Amin', in unison, his previous sins will be forgiven.)

It was said that the Hadith talks about both the angels and the Muslims saying Amin at the same time. The Hadith also refers to when the Amins said by the angels and the Muslims are equally sincere (thus bringing about forgiveness).

Further, it is recorded in Sahih Muslim that Abu Musa related to the Prophet that he said,

آ«ط¥ظگط°ظژط§ ظ‚ظژط§ظ„ظژ ظٹظژط¹ظ†ظگظٹ ط§ظ„ظ’ط¥ظگظ…ظژط§ظ…ظژ : ظˆظژظ„ظژط§ ط§ظ„ط¶ظ‘ظژط§ظ„ظ‘ظگظٹظ†ظژطŒ ظپظژظ‚ظڈظˆظ„ظڈظˆط§: ط¢ظ…ظگظٹظ†ظژطŒ ظٹظڈط¬ظگط¨ظ’ظƒظڈظ…ظڈ ط§ظ„ظ„ظ‡ظڈآ»

(When the Imam says, `Walad-dallin', say, `Amin' and Allah will answer your invocation.)

In addition, At-Tirmidhi said that `Amin' means, "Do not disappoint our hope'', while the majority of scholars said that it means. "Answer our invocation.''

Also, in his Musnad, Imam Ahmad recorded that `A'ishah said that when the Jews were mentioned to him, the Messenger of Allah said,

آ«ط¥ظگظ†ظ‘ظژظ‡ظڈظ… ظ„ظژظ†ظ’ ظٹظژط­ظ’ط³ظڈط¯ظڈظˆظ†ظژط§ ط¹ظژظ„ظژظ‰ ط´ظژظٹظ’ط،ظچ ظƒظژظ…ظژط§ ظٹظژط­ظ’ط³ظڈط¯ظڈظˆظ†ظژط§ ط¹ظژظ„ظژظ‰ ط§ظ„ظ’ط¬ظڈظ…ظڈط¹ظژط©ظگ ط§ظ„ظ‘ظژطھظگظٹ ظ‡ظژط¯ظژط§ظ†ظژط§ ط§ظ„ظ„ظ‡ظڈ ظ„ظژظ‡ظژط§ ظˆظژط¶ظژظ„ظ‘ظڈظˆط§ ط¹ظژظ†ظ’ظ‡ظژط§طŒ ظˆظژط¹ظژظ„ظژظ‰ ط§ظ„ظ’ظ‚ظگط¨ظ’ظ„ظژط©ظگ ط§ظ„ظ‘ظژطھظگظٹ ظ‡ظژط¯ظژط§ظ†ظژط§ ط§ظ„ظ„ظ‡ظڈ ظ„ظژظ‡ظژط§ ظˆظژط¶ظژظ„ظ‘ظڈظˆط§ ط¹ظژظ†ظ’ظ‡ظژط§ ظˆظژط¹ظژظ„ظژظ‰ ظ‚ظژظˆظ’ظ„ظگظ†ظژط§ ط®ظژظ„ظ’ظپظژ ط§ظ„ظ’ط¥ظگظ…ظژط§ظ…ظگ: ط¢ظ…ظگظٹظ†ظژآ»

(They will not envy us for anything more than they envy us for Friday which we have been guided to, while they were led astray from it, and for the Qiblah which we were guided to, while they were led astray from it, and for our saying `Amin' behind the Imam.)

Also, Ibn Majah recorded this Hadith with the wording,

آ«ظ…ظژط§ ط­ظژط³ظژط¯ظژطھظ’ظƒظڈظ…ظڈ ط§ظ„ظ’ظٹظژظ‡ظڈظˆط¯ظڈ ط¹ظژظ„ظژظ‰ ط´ظژظٹظ’ط،ظچ ظ…ظژط§ ط­ظژط³ظژط¯ظژطھظ’ظƒظڈظ…ظ’ ط¹ظژظ„ظژظ‰ ط§ظ„ط³ظ‘ظژظ„ظژط§ظ…ظگ ظˆظژط§ظ„طھظ‘ظژط£ظ’ظ…ظگظٹظ†ظگآ»

(The Jews have never envied you more than for your saying the Salam (Islamic greeting) and for saying Amin.) rgiveness). veneooA ? Further, it is recorded in Sahih Muslim that Abu Musa related to the Prophet that he said,

آ«ط¥ظگط°ظژط§ ظ‚ظژط§ظ„ظژ ظٹظژط¹ظ†ظگظٹ ط§ظ„ظ’ط¥ظگظ…ظژط§ظ…ظژ : ظˆظژظ„ظژط§ ط§ظ„ط¶ظ‘ظژط§ظ„ظ‘ظگظٹظ†ظژطŒ ظپظژظ‚ظڈظˆظ„ظڈظˆط§: ط¢ظ…ظگظٹظ†ظژطŒ ظٹظڈط¬ظگط¨ظ’ظƒظڈظ…ظڈ ط§ظ„ظ„ظ‡ظڈآ»

(When the Imam says, `Walad-dallin', say, `Amin' and Allah will answer your invocation.)

In addition, At-Tirmidhi said that `Amin' means, "Do not disappoint our hope'', while the majority of scholars said that it means. "Answer our invocation.''

Also, in his Musnad, Imam Ahmad recorded that `A'ishah said that when the Jews were mentioned to him, the Messenger of Allah said,

آ«ط¥ظگظ†ظ‘ظژظ‡ظڈظ… ظ„ظژظ†ظ’ ظٹظژط­ظ’ط³ظڈط¯ظڈظˆظ†ظژط§ ط¹ظژظ„ظژظ‰ ط´ظژظٹظ’ط،ظچ ظƒظژظ…ظژط§ ظٹظژط­ظ’ط³ظڈط¯ظڈظˆظ†ظژط§ ط¹ظژظ„ظژظ‰ ط§ظ„ظ’ط¬ظڈظ…ظڈط¹ظژط©ظگ ط§ظ„ظ‘ظژطھظگظٹ ظ‡ظژط¯ظژط§ظ†ظژط§ ط§ظ„ظ„ظ‡ظڈ ظ„ظژظ‡ظژط§ ظˆظژط¶ظژظ„ظ‘ظڈظˆط§ ط¹ظژظ†ظ’ظ‡ظژط§طŒ ظˆظژط¹ظژظ„ظژظ‰ ط§ظ„ظ’ظ‚ظگط¨ظ’ظ„ظژط©ظگ ط§ظ„ظ‘ظژطھظگظٹ ظ‡ظژط¯ظژط§ظ†ظژط§ ط§ظ„ظ„ظ‡ظڈ ظ„ظژظ‡ظژط§ ظˆظژط¶ظژظ„ظ‘ظڈظˆط§ ط¹ظژظ†ظ’ظ‡ظژط§ ظˆظژط¹ظژظ„ظژظ‰ ظ‚ظژظˆظ’ظ„ظگظ†ظژط§ ط®ظژظ„ظ’ظپظژ ط§ظ„ظ’ط¥ظگظ…ظژط§ظ…ظگ: ط¢ظ…ظگظٹظ†ظژآ»

(They will not envy us for anything more than they envy us for Friday which we have been guided to, while they were led astray from it, and for the Qiblah which we were guided to, while they were led astray from it, and for our saying `Amin' behind the Imam.)

Also, Ibn Majah recorded this Hadith with the wording,

آ«ظ…ظژط§ ط­ظژط³ظژط¯ظژطھظ’ظƒظڈظ…ظڈ ط§ظ„ظ’ظٹظژظ‡ظڈظˆط¯ظڈ ط¹ظژظ„ظژظ‰ ط´ظژظٹظ’ط،ظچ ظ…ظژط§ ط­ظژط³ظژط¯ظژطھظ’ظƒظڈظ…ظ’ ط¹ظژظ„ظژظ‰ ط§ظ„ط³ظ‘ظژظ„ظژط§ظ…ظگ ظˆظژط§ظ„طھظ‘ظژط£ظ’ظ…ظگظٹظ†ظگآ»

(The Jews have never envied you more than for your saying the Salam (Islamic greeting) and for saying Amin.)