كتاب الأطعمة
Read the English translation first, with the original Arabic directly underneath.
Narrated Zubayr ibn Uthman:
The Prophet (ﷺ) said: The wedding feast on the first day is a duty, that on the second is a good practice, but that on the third day is to make men hear of it and show it to them. Qatadah said: A man told me that Sa'id ibn al-Musayyab was invited (to a wedding feast on the first day and he accepted it. He was again invited on the second day, and he accepted. When he was invited on the third day, he did not accept; he said: They are the people who make men hear of it and show it to them.
الْوَلِيمَةُ أَوَّلُ يَوْمٍ حَقٌّ وَالثَّانِي مَعْرُوفٌ وَالْيَوْمُ الثَّالِثُ سُمْعَةٌ وَرِيَاءٌ