Abu Musa Ashari reported,
The Messenger of Allah ﷺ said, "When a man disciplines his slave-girl well, teaches her well, then frees her and marries her, he receives two rewards. When a man believed in Isa and then believed in me, he receives two rewards. And when a slave fears his Lord and obeys his masters, he receives two rewards."
Azami 8488
Sahihعن أبي موسى الأشعري قال
قال رسول الله ﷺ: إذا أدب الرجل أمته فأحسن تأديبها وعلمها فأحسن تعليمها ثم أعتقها فتزوجها كان له أجران وإذا آمن بعيسى ثم آمن بي فله أجران والعبد إذا اتقى ربه وأطاع مواليه فله أجران.
if they believe in the Prophet ﷺ if they believe in the Prophet ﷺBukhari related it in the hadiths of the prophets (3446), and Muslim in the book of faith (154:241), both through Salih bin Huyayy, from Shaybi, who said, Abu Burda told me, from Abu Musa Ashari, who mentioned it. This is the wording of Bukhari, and the wording of Muslim is similar, containing, "a man from the people of the Book who believed in his prophet and then lived to see the Prophet ﷺ and believed in him" without an explicit mention of Isa bin Maryam.