Hadithcore
Sahih al-Bukhari, 3858
sahih

Narrated Abu 'Is-haq Saud bin Abi Waqqas:

None embraced Islam, except on the day I embraced it. And for seven days I was one of the three persons who were Muslims (one-third of Islam).

حَدَّثَنِي إِسْحَاقُ، أَخْبَرَنَا أَبُو أُسَامَةَ، حَدَّثَنَا هَاشِمٌ، قَالَ سَمِعْتُ سَعِيدَ بْنَ الْمُسَيَّبِ، قَالَ سَمِعْتُ أَبَا إِسْحَاقَ، سَعْدَ بْنَ أَبِي وَقَّاصٍ يَقُولُ مَا أَسْلَمَ أَحَدٌ إِلاَّ فِي الْيَوْمِ الَّذِي أَسْلَمْتُ فِيهِ، وَلَقَدْ مَكَثْتُ سَبْعَةَ أَيَّامٍ وَإِنِّي لَثُلُثُ الإِسْلاَمِ

References2 variants
In-Book Reference
Book 63, Hadith 83
USC-MSA web (English) reference
Vol. 5, Book 58, Hadith 198 (deprecated numbering scheme)
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