If the one praying recites al-Fatihah without emphasis, is his prayer invalid?
Machine translationRead the Arabic original
Question : If the imam or the one praying behind him recites al-Fatihah without emphasis, does the prayer remain valid?
Answer : It is known that if he says[Al-Fatihah 1:2-4] and the men are correct. Or if it is out of ignorance, but if he is ignorant and a long time has passed and he is one of those who, meaning, does not know these things, then the correct view is that he owes nothing.
Answer : It is known that if he says
(2) [All] praise is [due] to Allah, Lord of the worlds - (3) The Entirely Merciful, the Especially Merciful, (4) Sovereign of the Day of Recompense.
الْحَمْدُ لِلَّهِ رَبِّ الْعَالَمِينَ الرَّحْمَٰنِ الرَّحِيمِ مَالِكِ يَوْمِ الدِّينِ
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 889 - إذا المصلي قرأ الفاتحة بغير تشديد هل تبطل صلاته؟ الكافي في فقه الإمام أحمد بن حنبل -ابن عثيمين — youtube.com
The Arabic text is a machine transcription of the audio recording.