Hadith 28 and 29
Abu Said Al-Khudri (ra) narrated : Allah’s Messenger (Peace be upon him) said:
“if a person embraces Islam sincerely, then Allah shall forgive his past sins, and after than starts the settlement of accounts: the reward of his good deeds will be ten times to seven hundred times for each good deed, and an evil deed will be recorded as it is unless Allah forgives it.”
(Sahih Bukhari Vol. 1 Hadith 40A)One more similar Hadith
Abu Hurairas (ra) Narrated: Allah’s Messenger (peace be upon him) said:
“If any one of you improves (follows strictly) his Islamic religion, then his good deeds will be rewarded ten times to seven hundred times for each good deed and a bad deed will be recorded as it is.”
(Sahih Bukhari, Vol 1 , Hadith 40B)