Abu Dawud said: Khalid b. Qais reported this tradition in this manner, but he disagreed in respect of chain (of transmitters) and agreed in respect of the text.
In-book : Book 2, Hadith 664
English translation : Book 3, Hadith 1048
2. Prayer (Kitab Al-Salat)
باب كَفَّارَةِ مَنْ تَرَكَهَا