Allah's Messenger (ﷺ) said, "If a person embraces Islam sincerely, then Allah shall forgive all his past sins, and after that starts the settlement of accounts, the reward of his good deeds will be ten times to seven hundred times for each good deed and one evil deed will be recorded as it is unless Allah forgives it."
Reference: Sahih al-Bukhari 41 In-book : Book 2, Hadith 34 USC-MSA web (English) : Vol. 1, Book 2, Hadith 41 (deprecated)
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