Imam Maalik مالك بن أنس بن مالك بن أبي عامر · The Book of Wills

"The Messenger of Allah delivered a Khutbah and said: 'Allah has given every person who has rights his due, and there is no bequest to an heir.'"

"Allah has given each person a share of the inheritance, and it is not permissible to give bequests to an heir."

"I said: 'O Messenger of Allah, what kind of charity is best?' He said: 'Providing drinking water.'"