Mishkat al-Masabih #3251
Emancipation
‘Amr b. ‘Abasa reported the Prophet as saying, “If anyone builds a mosque that God may be mentioned in it, a house will be built for him in paradise; if anyone emancipates a Muslim, that will be his ransom from jahannam; if anyone develops a grey hair while in 'God’s path, it will be a light for him on the day of resurrection.”
It is transmitted in Sharh as-sunna.
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About Mishkat al-Masabih
This hadith is #3251 from Mishkat al-Masabih, in the Book of Emancipation. Mishkat al-Masabih contains 4,428 hadiths across 25 books.