This honorable Surah (chapter 9) was one of the last Surahs to be revealed to the Messenger of Allah . Al-Bukhari recorded that Al-Bara' said, "The last Ayah to be revealed was,

[يَسْتَفْتُونَكَ قُلِ اللَّهُ يُفْتِيكُمْ فِى الْكَلَـلَةِ]

(They ask you for a legal verdict. Say: "Allah directs (thus) about Al-Kalalah.'') [4:176], while the last Surah to be revealed was Bara'ah.'' The Basmalah was not mentioned in the beginning of this Surah because the Companions did not write it in the complete copy of the Qur'an (Mushaf) they collected, following the Commander of the faithful, `Uthman bin `Affan, may Allah be pleased with him. The first part of this honorable Surah was revealed to the Messenger of Allah when he returned from the battle of Tabuk, during the Hajj season, which the Prophet thought about attending. But he remembered that the idolaters would still attend that Hajj, as was usual in past years, and that they perform Tawaf around the House while naked. He disliked to associate with them and sent Abu Bakr As-Siddiq, may Allah be pleased with him, to lead Hajj that year and show the people their rituals, commanding him to inform the idolaters that they would not be allowed to participate in Hajj after that season. He commanded him to proclaim,

[بَرَآءَةٌ مِّنَ اللَّهِ وَرَسُولِهِ]

(Freedom from (all) obligations (is declared) from Allah and His Messenger ()...), to the people. When Abu Bakr had left, the Messenger sent `Ali bin Abu Talib to be the one to deliver this news to the idolators on behalf of the Messenger , for he was the Messenger's cousin. We will mention this story later.