Sahih Adab al-Mufrad

It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) ascended the pulpit. When he stepped on the first step, he said: "Ameen." Then when he ascended the second step, he said: "Ameen." Then when he ascended the third step, he said: "Ameen." The people asked, "O Messenger of Allah! We heard you say 'Ameen' three times?" The Prophet (peace and blessings of Allah be upon him) said: "When I ascended the first step, Jibreel came to me and said: 'Wretched is the servant who finds Ramadan and lets it pass without being forgiven.' I said: 'Ameen.' Then he said: 'Wretched is the servant who finds his parents, one or both of them, in old age and does not enter Paradise by serving them.' I said: 'Ameen.' Then he said: 'Wretched is the person in whose presence your name is mentioned and he does not send blessings upon you.' I said: 'Ameen.'"