Sayyiduna Suwayd bin al-Nu'man (may Allah be pleased with him) said: We set out with the Messenger of Allah (peace and blessings be upon him) towards Khaybar, until we reached al-Sahba', and between it and Khaybar there was only a rawhah (a short distance). The Messenger of Allah (peace and blessings be upon him) called for the people's provisions, and nothing was brought except sawiq (barley meal). He (peace and blessings be upon him) chewed it and we chewed it too. Then he (peace and blessings be upon him) stood up, rinsed his mouth, and then led the Zuhr and Asr prayers.
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6425