From Sahih Bukhari (Hadith 3070):
Narrated Jabir bin `Abdullah:I said, "O Allah's Messenger (ﷺ)! We have slaughtered a young sheep of ours and have ground one Sa of barley. So, I invite you along with some persons." So, the Prophet (ﷺ) said in a loud voice, "O the people of the Trench! Jabir has prepared "Sur" so come along
Reference: Bukhari 3070