(1) باب مَا جَاءَ فِي إِجَابَةِ الدَّعْوَةِ
The tradition mentioned above has also been transmitted by Ibn 'Umar to the same effect through a different chain of narrators. This version has the additional words:
If he is not fasting, he should eat, and if he is fasting, he should leave it. (JA)
Reference (JA): Sunan Abi Dawud 3737 (JA)
In-book reference (JA): Book 28, Hadith 2 (JA)
English translation (JA): Book 27, Hadith 3728 (JA)