Abu Dawud said: If you are invited to a wedding feast before you, do not take it until the owner of the house (i.e. the host) allows you (to eat).
In-book : Book 28, Hadith 29
English translation : Book 27, Hadith 3755
28. 'Foods (Kitab Al-At''imah)'
باب فِي الْبَوْلِ فِي الْمُسْتَحَمِّ