Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا غُنْدَرٌ، حَدَّثَنَا شُعْبَةُ، سَمِعْتُ قَتَادَةَ، عَنْ أَنَسٍ ـ رضى الله عنه ـ {إِنَّا فَتَحْنَا لَكَ فَتْحًا مُبِينًا} قَالَ الْحُدَيْبِيَةُ.Narrated Anas:"Verily, We have given you (O Muhammad) a manifest victory.' refers to Al-Hudaibiya Peace treaty
From Sahih al-Bukhari, whose reports the scholars accept as authentic.