A man embraced Islam and then reverted back to Judaism. Mu`adh bin Jabal came and saw the man with Abu Musa. Mu`adh asked, "What is wrong with this (man)?" Abu Musa replied, "He embraced Islam and then reverted back to Judaism." Mu`adh said, "I will not sit down unless you kill him (as it is) the verdict of Allah and His Apostle.
Reference: Sahih al-Bukhari 7157 In-book : Book 93, Hadith 21 USC-MSA web (English) : Vol. 9, Book 89, Hadith 271 (deprecated)
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