(36) باب كَلاَمِ الرَّبِّ عَزَّ وَجَلَّ يَوْمَ الْقِيَامَةِ مَعَ الأَنْبِيَاءِ وَغَيْرِهِمْ
Narrated Anas:
I heard the Prophet (ﷺ) saying, "On the Day of Resurrection I will intercede and say, "O my Lord! Admit into Paradise (even) those who have faith equal to a mustard seed in their hearts." Such people will enter Paradise, and then I will say, 'O (Allah) admit into Paradise (even) those who have the least amount of faith in their hearts." Anas then said: As if I were just now looking at the fingers of Allah's Apostle.
Reference: Sahih al-Bukhari 7509
In-book reference: Book 97, Hadith 134
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 93, Hadith 600