Sunan Ibn Majah, Book 5, Hadith 1434 (In-Book) ⓘ
It was narrated from Abu Hurairah that the Prophet said: “When anyone of you gets up to pray at night, and his tongue stumbles over the words of the Qur’an, and he does not know what he is saying, let him lie down.”
حَدَّثَنَا يَعْقُوبُ بْنُ حُمَيْدِ بْنِ كَاسِبٍ، حَدَّثَنَا حَاتِمُ بْنُ إِسْمَاعِيلَ، عَنْ أَبِي بَكْرِ بْنِ يَحْيَى بْنِ النَّضْرِ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ النَّبِيَّ ـ صلى الله عليه وسلم ـ قَالَ " إِذَا قَامَ أَحَدُكُمْ مِنَ اللَّيْلِ فَاسْتَعْجَمَ الْقُرْآنُ عَلَى لِسَانِهِ فَلَمْ يَدْرِ مَا يَقُولُ اضْطَجَعَ " .
also referenced under: Hadith 1372 (Reference) & Volume 2, Book 5, Hadith 1372 (DarusSalam)