Hadith #3965 (Sunan Abi Dawud)
Book: The Book of Manumission of Slaves
Narrator(s): Abd al-Whab bin Njd'h عبد الوهاب بن نجدة, Baqiyya bin al-Walid bin Sa'aid بقية بن الوليد بن صائد, Safwan bin 'Amr bin Harm al-Saksaki صفوان بن عمرو بن هرم السكسكي, Sharhbayl bin al-Samat, Sulaym bin 'Amir al-Kula'i al-Khaba'ri سليم بن عامر الكلاعي الخبائري
Grade: Sahih

Along with the Messenger of Allah (ﷺ) we besieged the palace of at-Ta’if. The narrator, Mutadh, said: I heard my father (sometimes) say: “Palace of at-Ta’if,” and (sometimes) “Fort of at-Ta’if,” which are the same.
I heard the Messenger of Allah (ﷺ) say: he who causes an arrow to hit its mark in Allah’s cause will have it counted as a degree for him (in Paradise). He then transmitted the rest of the tradition.
I heard the Messenger of Allah (ﷺ) say: If a Muslim man emancipates a Muslim man, Allah, the Exalted, will make every bone of his protection for every bone of his emancipator from Hell; and if a Muslim woman emancipates a Muslim woman, Allah will make every bone of hers protection for every bone of her emancipator from Hell on the Day of Resurrection.

Source: https://parallelquran.com/hadith/sunan-abi-dawud-3965/

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Hadith #3966 (Sunan Abi Dawud)
Book: The Book of Manumission of Slaves
Narrator(s): Amr bin Murrah bin 'Abdullah عمرو بن مرة بن عبد الله بن طارق, Hafs bin 'Umar bin al-Harith حفص بن عمر بن الحارث, Salm bin Abi al-Ja'd سالم بن أبي الجعد, Sharhbayl bin al-Samat, Shu'bah bin al-Hajjaj شعبة بن الحجاج
Grade: Sahih

I heard the Messenger of Allah (ﷺ) say: If anyone emancipates a Muslim slave, that will be his ransom from Jahannam.

Source: https://parallelquran.com/hadith/sunan-abi-dawud-3966/