A man called Amr came to the Prophet Muhammad (peace be upon him) and said, “Give me your right hand so that I may give you my pledge of loyalty.” The Prophet (peace be upon hi) stretched out his right hand. Amr withdrew his hand. The Prophet (peace be upon him) said: "What has happened to you, O Amr?" He replied, "I intend to lay down a condition.” The Prophet asked: "What condition do you intend to put forward?" Amr said, “That God forgive my sins.” The Prophet said: "Didn’t you know that converting to Islam erases all previous sins?" (Narrated in Saheeh Muslim, #121, and Mosnad Ahmad, #17357)

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