Chapter 26: The Book of Wills
Ibn 'Abbas (Allah be pleased with them) said: (I wish) if people would reduce from third to fourth (part for making a will of their property), for Allah' s Messenger (ﷺ) said: So far as the third (part) is concerned it is quite substantial. In the hadith transmitted on the authority of Waki (the words are)" large" or" much".
Sahih Muslim 1629