Hadith 1

Riyad as-Salihin

Book 2: The Book About the Etiquette of Eating

Chapter 100

Saying Bismillah Before and Al-Hamdulillah After Eating

باب التسمية في أوله والحمد في آخره

Riyad as-Salihin 727
عن عمر بن أبى سلمة رضى الله عنهما قال‏:‏ قال لي رسول الله صلى الله عليه وسلم‏:‏‏ ‏.‏ ((متفق عليه))
"‏سم الله وكل بيمينك، وكل مما يليك‏"
'Umar bin Abu Salamah (May Allah be pleased with him) reported:

Messenger of Allah (ﷺ), said to me, "Mention Allah's Name (i.e., say Bismillah before starting eating), eat with your right hand, and eat from what is near you." [Al-Bukhari and Muslim].