The Book of the Sunnah
0/11.7. Chapter:
The Virtue of Sa`d ibn Abi Waqqas (ra)
Sunan Ibn Majah
حَدَّثَنَا مَسْرُوقُ بْنُ الْمَرْزُبَانِ، حَدَّثَنَا يَحْيَى بْنُ أَبِي زَائِدَةَ، عَنْ هَاشِمِ بْنِ هَاشِمٍ، قَالَ سَمِعْتُ سَعِيدَ بْنَ الْمُسَيَّبِ، يَقُولُ قَالَ سَعْدُ بْنُ أَبِي وَقَّاصٍ مَا أَسْلَمَ أَحَدٌ فِي الْيَوْمِ الَّذِي أَسْلَمْتُ فِيهِ وَلَقَدْ مَكَثْتُ سَبْعَةَ أَيَّامٍ وَإِنِّي لَثُلُثُ الإِسْلاَمِ .
It was narrated that Hashim bin Hashim said: "I heard Sa'eed bin Musayyab say: 'Sa'd bin Abu Waqqas said: 'No one else became Muslim on the same day as I did; for seven days I was one-third of Islam.'"
Reference : Sunan Ibn Majah 132In-book reference : Introduction, Hadith 0English translation : Vol. 1, Book 1, Hadith 132