Sahih Muslim 27a

Abu Bakr ibn al-Nadr ibn Abi al-Nadr narrated to us; Abu al-Nadr, Hashim ibn al-Qasim, narrated to me; Ubaydullah al-Ashja'i narrated to us, from Malik ibn Mighwal, from Talhah ibn Musarrif, from Abu Salih, from Abu Hurayrah, who said: We were with the Prophet (peace and blessings be upon him) on a journey. The people's provisions ran out—he said, until he was about to slaughter some of their camels. Umar said, ‘Messenger of Allah, if you gathered what remains of the people's provisions and invoked Allah over them?’ He did so. The person who had wheat brought his wheat, and the person who had dates brought his dates. Mujahid said: The person who had date stones brought his date stones. I said, ‘What did they do with the stones?’ He said, ‘They sucked them and drank water afterward.’ He invoked blessing over the provisions until the people filled their provision bags. At that point he said, ‘I bear witness that there is no deity except Allah and that I am the Messenger of Allah. No servant meets Allah with these two, without doubting them, except that he enters Paradise.’