Regarding Prophet ordering killing Bint Marwan, It is a fabricated story spread by Christians missionary on false Hadiths...... The story of the killing of 'Asma' bint Marwan is mentioned by Ibn Sa'd in "Kitab At-Tabaqat Al-Kabir"[1] and by the author of "Kinz-ul-'Ummal" under number 44131 who attributes it to Ibn Sa'd, Ibn 'Adiyy and Ibn 'Asaker. What is interesting is that Ibn 'Adiyy mentions it in his book "Al-Kamel" on the authority of Ja'far Ibn Ahmad Ibn Muhammad Ibn As-Sabah on authority of Muhammad Ibn Ibrahim Ash-Shami on authority of Muhammad Ibn Al-Hajjaj Al-Lakhmi on authority of Mujalid on authority of Ash-Shu'abi on authority of Ibn 'Abbas, and added that
...this isnad (chain of reporters) is not narrated on authority of Mujalid but by Muhammad Ibn Al-Hajjaj and they all (other reporters in the chain) accuse Muhammad Ibn Al-Hajjaj of forging it.[2] It is also reported by Ibn al-Gawzi in "Al-'Ilal"[3] and is listed among other flawed reports. So according to its isnad, the report is forged - because one of its reporters is accused of fabricating hadith. Hence, such a story is better put in trash can.
