(1) باب الْوَصِيَّةِ بِالثُّلُثِ
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: Sahih Muslim 1629
In-book reference: Book 25, Hadith 15
USC-MSA web (English) reference(deprecated numbering scheme): Book 13, Hadith 4000