Sunan an-Nasa'i 2209
سنن النسائي#2209Da'ifA 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)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahDaif
Al-AlbaniDaif
Zubair Ali ZaiDaif
In-book reference: 22:120