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."
وَحَدَّثَنِي مُحَمَّدُ بْنُ الْمُثَنَّى، وَابْنُ، بَشَّارٍ قَالاَ حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، عَنْ سِمَاكٍ، بِهَذَا الإِسْنَادِ نَحْوَهُ . وَلَمْ يَذْكُرْ فَكَانَ بَعْدُ الثُّلُثُ جَائِزًا .
Muslim
The Book of Wills • Hadith 10