Sahih al-Bukhari, Book 10, Hadith 150 (In-Book) ⓘ
Narrated 'Ubada bin As-Samit: Allah's Messenger said, "Whoever does not recite Al-Fatiha in his prayer, his prayer is invalid."
حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، قَالَ حَدَّثَنَا سُفْيَانُ، قَالَ حَدَّثَنَا الزُّهْرِيُّ، عَنْ مَحْمُودِ بْنِ الرَّبِيعِ، عَنْ عُبَادَةَ بْنِ الصَّامِتِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " لاَ صَلاَةَ لِمَنْ لَمْ يَقْرَأْ بِفَاتِحَةِ الْكِتَابِ " .
also referenced under: Hadith 756 (DarusSalam) & Volume 1, Book 12, Hadith 723 (USC-MSA)