ভূমিকা
And know that among you is Allah’s Apostle… (49:6-7)” It is mentioned that this Holy verse was revealed by Allah in the context of the transgressor Walid and Bani Mustaliq; that some Muslims provoked the Prophet to send an army for killing the tribe (Bani Mustaliq). Then this verse was revealed: O those who believe! If a transgressor who crosses all limits and who does not obey God’s commands brings any news to you, you must not be impressed by him.
Perhaps you may, through ignorance, inflict undue harm – Walid came and brought for you such falsehood and untrue allegations. You have no right to believe them and to send an army for fighting. Make investigation and see that this man lies; he may be avenging his past dealings, he may be showing selfishness. That (the other) group may be faultless and may not have the alleged faults. So make inquiries.
Khalid goes for investigation It is written in commentary of Qur’an that the Holy Prophet, in this dispute, sent Khalid and told him. Go and see how the behavior of these people is. Does Walid tell the truth? Have they left Islam or not? Khalid went alone, met the tribe and saw strange things! In the afternoon came the sound of the call for prayer (Allaho Akbar). Immediately after sunset also he heard this call. They all came and lined up in the mosque for prayers.
Then he returned and informed the Holy Prophet of this. Walid became disgraceful and so also all those who had said that Walid told the truth and that army should be sent to Bani Mustaliq. Almighty God now gives an eternal command for all time to come that believers must never accept any allegation against any believer until they became certain about the matter. If someone comes and says such and such Muslim has become a disbeliever or transgressor it must not be believed instantly.
If you Muslims believe him at once, you know how dangerous it is. They say such and such man is a Sufi. Let it no be so that you should believe whatever he says.