Hadith #4965 (Sahih al-Bukhari)
Book: Wedlock, Marriage (Nikaah)
Narrator(s): Safiyya bint Abi 'Ubaid al-Thaqafi صفية بنت أبي عبيد بن مسعود الثقفية
Grade: Sahih

The Prophet (ﷺ) gave a banquet with two Mudds of barley on marrying some of his wives. (1 Mudd= 1 3/4 of a kilogram) .

Source: https://parallelquran.com/hadith/sahih-al-bukhari-4965/