question #2 Sahih al-Bukhari 2538, Book 49, Hadith 22 : What is the significance of charity and freeing slaves in Islamic teachings?

My father told me that Hakim bin Hizam manumitted one-hundred slaves in the Pre-Islamic period of
ignorance and slaughtered one-hundred camels (and distributed them in charity). When he embraced
Islam he again slaughtered one-hundred camels and manumitted one-hundred slaves. Hakim said, “I
asked Allah’s Messenger (ﷺ), ‘O Allah’s Messenger (ﷺ)! What do you think about some good deeds I used to
practice in the Pre-Islamic period of ignorance regarding them as deeds of righteousness?’ Allah’s
Apostle said, “You have embraced Islam along with all those good deeds you did.”