Sunan Abu Dawud
3737
Sahih+3

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

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid