• My servant, and My servant will receive what he asks for. Then, when he (the worshipper) says: Guide us to the straight path, the path of those to whom Thou hast been Gracious -- not of those who have incurred Thy displeasure, nor of those who have gone astray, He (Allah) says: This is for My servant, and My servant will receive what he asks for. [Muslim 4: 395]

    34. SAYING 'AMEEN' DURING PRAYER:

    After finishing the recitation of al-Fatihah, the saying of'Ameen' in congregation. The Prophet (SAW) said: 'When the Imam says 'Ameen', then recite it behind him (as well), because whoever's Ameen coincides with the Ameen of the angels will have all of his sins forgiven.' [Sahih al-Bukhari #780, Muslim #410 and others]

    35. WHILE VISITING THE SICK, AND DUA MADE BY THE SICK:

    Umm Salamah narrated that the Prophet (SAW) said: 'When you visit the sick, or the dead then say good, because the angels say 'Ameen' to whatever you say [Muslim #2126]

    Ali (RA) reported that the Prophet (SAW) said: 'When a Muslim visits his sick Muslim brother in the morning, seventy thousand angels make dua for his forgiveness till the evening. And when he visits him in the evening, seventy thousand angels make dua for his forgiveness till the morning, and he will be granted a garden for it in Jannah.'
    [at-Tirmidhi, abu Dawud]