Sunan At-Tirmidhi

Narrated Qatadah: From Anas: ""The Prophet (ﷺ) prohibited that a man should drink while standing."" (Qatadah said:) So it was said: ""And eating ?"" He (Anas) said: ""That is worse."" [Abu 'Eisa said:] This Hadith is Hasan Sahih