Sahih Muslim 4213
The Book of Wills
وَحَدَّثَنِي مُحَمَّدُ بْنُ الْمُثَنَّى، وَابْنُ، بَشَّارٍ قَالاَ حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، عَنْ سِمَاكٍ، بِهَذَا الإِسْنَادِ نَحْوَهُ . وَلَمْ يَذْكُرْ فَكَانَ بَعْدُ الثُّلُثُ جَائِزًا .
This hadith has been narrated on the authority of Simak with the same chain of transmitters. But he did not mention:" It was then that one-third became permissible
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.