It is narrated from Sayyiduna Hudhayfah (may Allah be pleased with him) that he said: Nothing prevented us from taking part in the Battle of Badr except that my father and I were coming along when the disbelievers of Quraysh seized us. They asked: "Do you intend to go to Muhammad (peace and blessings be upon him)?" We said: "No, we have no such intention; we only want to go to Madinah." So they took from us a firm covenant and pledge by Allah that we would go only to Madinah and would not fight (against them) alongside Muhammad (peace and blessings be upon him). When we had got away from them, we came to the Messenger of Allah (peace and blessings be upon him) and told him everything they had said and what we had replied. He (peace and blessings be upon him) said: "We seek Allah's help against them, and we will fulfil their covenant." So we went to Madinah, and this is what prevented us from taking part in Badr. This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.