I heard the Messenger of Allah (ﷺ) say: Allah has appointed for everyone who has a right what is due to him, and no bequest must be made to an heir.
Sunan Abi Dawud Book 18, Hadith 9
← Previous Hadith The Qur'anic verse goes: "(It is prescribed when death approaches any of you), if he leaves any goods, that he may bequest to parents and next to kin." The bequest was made in this way until the verse of inheritance repealed it.

Sunan Abi Dawud Book 18, Hadith 8 Next Hadith → When Allah, Most High, revealed the verses: "Come not nigh to the orphan's property except to improve it". And "Those who unjustly eat up the property of orphans", everyone who had an orphan with him went and separated his food from his (orphan's) food, and his drink from his drink, and began to detain the remaining food which he (the orphan) himself ate or spoiled.

This fell heavy on them, and they mentioned this to the Messenger of Allah (ﷺ). So Allah, Most High, revealed the verse: "They ask thee concerning orphans. Say: The best thing to do is what is for their good; if ye mix their affairs with yours, they are your brethren." Then they mixed their food with his food and their drink with his drink.

Sunan Abi Dawud Book 18, Hadith 10