Once the journey-food of the people ran short and they were in great need. So, they came to the Prophet to take his permission for slaughtering their camels, and he permitted them. Then `Umar met them and they informed him about it. He said, "What will sustain you after your camels (are finished)?" Then `Umar went to the Prophet (ﷺ) and said, "O Allah's Messenger (ﷺ)! What will sustain them after their camels (are finished)?" Allah's Messenger (ﷺ) said, "Make an announcement amongst the people that they should bring all their remaining food (to me)." (They brought it and) the Prophet (ﷺ) invoked Allah and asked for His Blessings for it. Then he asked them to bring their food utensils and the people started filling their food utensils with their hands till they were satisfied. Allah's Messenger (ﷺ) then said, "I testify that None has the right to be worshipped but Allah, and I am His Apostle. "
Sahih al-Bukhari Book 56, Hadith 191
← Previous Hadith That he went out in the company o; the Prophet (ﷺ) during the year of Khaibar (campaign till they reached a place called As-Sahba', the lower part of Khaibar. They offered the `Asr prayer (there) and the Prophet asked for the food. Nothing but Sawiq was brought to the Prophet. So, they chewed it and ate it and drank water. After that the Prophet (ﷺ) got up, washed his mouth, and they too washed their mouths and then offered the prayer.

Sahih al-Bukhari Book 56, Hadith 190 Next Hadith → Jabir bin `Abdullah said, "We set out, and we were three-hundred men carrying our journey-food on our shoulders. Then we began to eat a single date each per day." A man asked (Jabir), "O Abu `Abdullah! How could a person be satisfied with a single date?" Jabir replied, "We realized the value of that one date when we could not even have that much till we reached the sea-shore, when all of a sudden we saw a huge fish cast by the sea. So, we ate of it as much as we wished for eighteen days."

Sahih al-Bukhari Book 56, Hadith 192