Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
حَدَّثَنَا الْحَسَنُ، حَدَّثَنَا قُرَّةُ بْنُ حَبِيبٍ، حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنْ أَبِيهِ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ مَا شَبِعْنَا حَتَّى فَتَحْنَا خَيْبَرَ.Narrated Ibn `Umar:We did not eat our fill except after we had conquered Khaibar
From Sahih al-Bukhari, whose reports the scholars accept as authentic.