The Messenger of Allah (ﷺ) forbade selling or giving away the right to inheritance by a manumitted slave.
Sunan Abi Dawud Book 19, Hadith 35
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Sunan Abi Dawud Book 19, Hadith 34 Next Hadith → The Prophet (ﷺ) said: When an infant has raised its voice (and then dies), it will be treated as an heir.

Sunan Abi Dawud Book 19, Hadith 36