Sunan an-Nasa'i, Volume 3, Book 22, Hadith 2211 (DarusSalam) ⓘ
A similar report was narrated from Abu Salamah and he said: "Whoever fasts it and spends its nights in prayer out of faith and in the hope of reward." (Daif)
أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ أَنْبَأَنَا النَّضْرُ بْنُ شُمَيْلٍ، قَالَ أَنْبَأَنَا الْقَاسِمُ بْنُ الْفَضْلِ، قَالَ حَدَّثَنَا النَّضْرُ بْنُ شَيْبَانَ، عَنْ أَبِي سَلَمَةَ، فَذَكَرَ مِثْلَهُ وَقَالَ " مَنْ صَامَهُ وَقَامَهُ إِيمَانًا وَاحْتِسَابًا " .
also referenced under: Hadith 2209 (Reference) & Book 22, Hadith 120 (In-Book)