"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.'" (Using translation from Ibn Mājah 132)
سَعْدُ بْنُ أَبِي وَقَّاصٍ «مَا أَسْلَمَ أَحَدٌ إِلَّا فِي الْيَوْمِ الَّذِي أَسْلَمْتُ فِيهِ وَلَقَدْ مَكَثْتُ سَبْعَةَ أَيَّامٍ وَإِنِّي لَثُلُثُ الْإِسْلَامِ»