Is it prescribed for one who hears the imam reciting al-Fatihah while not being a ma'mum to say "Ameen" with the imam?
Machine translationRead the Arabic original
The questioner : Yes. Shaykh, is it prescribed for one who, for example, hears the imam reciting while not praying with him to say "Ameen"?
The Shaykh : No. It is not prescribed because he is not reciting for it.
The Shaykh : No. It is not prescribed because he is not reciting for it.
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 2984 - 4600 هل يشرع لمن يسمع قراءة الإمام للفاتحة وهو غير مأموم أن يأمن مع الإمام؟ ابن عثيمين — youtube.com
The Arabic text is a machine transcription of the audio recording.