The Prophet ﷺ said, "Whoever has even an atom's weight of faith in his heart will be taken out of the Fire."Abu Saeed said, "Whoever doubts this, let him recite 'Indeed, Allah does not wrong even by the weight of an atom' [Nisa 4:40]."He said, this is a hasan sahih hadith.
حدثنا سلمة بن شبيب حدثنا عبد الرزاق أخبرنا معمر عن زيد بن أسلم عن عطاء بن يسار
أن النبي ﷺ قال يخرج من النار من كان في قلبه مثقال ذرة من الإيمان قال أبو سعيد فمن شك فليقرأ {إن الله لا يظلم مثقال ذرة} قال هذا حديث حسن صحيح
Bukhari also related it at length in the Book of Tawhid, chapter on Allah's saying, "Faces, that day, radiant, looking at their Lord" [Qiyamah 75:22–23], hadith 7439, from the hadith of Zayd bin Aslam, at length. It is also found in Musannaf Abdul-Razzaq, 20857.