Jami` at-Tirmidhi Book 26, Hadith 20
"We would eat during the time of the Messenger of Allah (ﷺ) while we were walking, and we would drink while we were standing."
This Hadith is Hasan Sahih Gharib as a narration of 'Ubaidullah bin 'Umar, from Nafi', from Ibn 'Umar. 'Imran bin Hudair reported this Hadith from Abu Al-Bazari, from Ibn 'Umar. Abu Al-Bazari's name is Yazid bin 'Utarid.
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."
This Hadith is Hasan Sahih.
"The Prophet (ﷺ) prohibited drinking while standing."
And there are narrations on this topic from Abu Sa'eed, Abu Hurairah, and Anas. And this Hadith is Hasan Gharib. This Hadith was reported from other narrators, from Sa'eed, from Qatadah, from Abu Muslim, from Al-Jarud, that the Prophet (ﷺ) said: "The Muslim's wandering (animal) stirs the Fire." Al-Jarud bin Al-Mu'alla is called Ibn Al-'Al' but what is correct is Al-Mu'alla.