Abu Musa Ashari reported,

The Messenger of Allah ﷺ said, "Three people will receive a double reward. A man from the People of the Book who believed in his prophet and then believed in Muhammad ﷺ. A bondsman who fulfills both his duty to Allah and his duty to his masters. And a man who has a slave-girl, raises her well, teaches her well, then frees her and marries her. He will receive two rewards."

Azami 12966

Sahih

عن أبي موسى الأشعري قال

قال رسول الله ﷺ: ثلاثة لهم أجران، رجل من أهل الكتاب، آمن بنبيه، وآمن بمحمد ﷺ، والعبد المملوك إذا أدى حق الله، وحق مواليه، ورجل كانت عنده أمة، فأدبها فأحسن تأديبها، وعلمها، فأحسن تعليمها، ثم أعتقها، فتزوجها، فله أجران.

الأعظمي 12966صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Tafsir of the great Quran
Chapter
Tafsir of Surah Qasas
Section
His saying, "And We have certainly connected for them the word that perhaps they will be reminded. Those to whom We gave the Scripture before it, they believe in it. And when it is recited to them, they say, We have believed in it; indeed, it is the truth from our Lord. Indeed, we were Muslims before it. Those will be given their reward twice because they were patient and they repel evil with good, and from what We have provided them they spend"
Numbering
Jami al-Kamil 12966 (2nd edition)
Azami 12966