It wasnarrated from Jabir that the Messenger of Allah (ﷺ) said:
"Whoeveris invited to eat when he is fasting, let him accept theinvitation;and if he wants to let him eat, and if he wants let himnot eat." (ES)
English reference (ES): Vol. 1, Book 7, Hadith 1751 (ES)
Arabic reference (ES): Book 7, Hadith 1823 (ES)