From Sahih Muslim (Hadith 4218):
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
Reference: Muslim 4218