The tribe of Bani Mustaliq were planning to launch a surprise  attack against the Muslims, and rumor of it reached Prophet Muhammad. He sent a companion named Buraydah ibn al-Husayb to investigate. The rumor was confirmed.

This lecture covers:
- The attack Prophet Muhammad led in response
- The secret hypocrites who joined this battle
- The battle's outcome
- The Prophet's political marriage to Juwayriyya bint al-Harith, the daughter of Bani Mustaliq's chief
- Prophet Muhammad's response to munafiq Abdullah ibn Ubayy criticizing the Muhajireen during the return trip to Medina
- Allah revealing Surah Munafiqun to expose ibn Ubayy, and an explanation of the verses

Lecture notes available at http://www.why-quran.org/?p=602.

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Video recording of this lecture + Q&A available on YouTube at https://www.youtube.com/watch?v=pOFFolfr8a8&list=PLpkB0iwLgfTat-Pgh4W3WFmupPamiC9UT.