The Messenger of Allah ﷺ said, "There shall come out of the Fire," and Shuba said, "Bring out of the Fire whoever said 'There is no god but Allah' and had in his heart goodness equal to the weight of a barley grain. Bring out of the Fire whoever said 'There is no god but Allah' and had in his heart goodness equal to the weight of a wheat grain. Bring out of the Fire whoever said 'There is no god but Allah' and had in his heart goodness equal to the weight of an atom."Shuba said, "The weight of an atom," pronouncing it lightly.
حدثنا محمود بن غيلان حدثنا أبو داود حدثنا شعبة وهشام عن قتادة
أن رسول الله ﷺ قال يخرج من النار وقال شعبة أخرجوا من النار من قال لا إله إلا الله وكان في قلبه من الخير ما يزن شعيرة أخرجوا من النار من قال لا إله إلا الله وكان في قلبه من الخير ما يزن برة أخرجوا من النار من قال لا إله إلا الله وكان في قلبه من الخير ما يزن ذرة وقال شعبة ما يزن ذرة مخففة
Graded muttafaq alayh (agreed upon by Bukhari and Muslim). Bukhari narrated it in the Book of Faith, chapter on the increase and decrease of faith, no. 44, and Muslim, no. 325/193, from the hadith of Hisham, with this same wording. It is also found in Musnad Abu Dawud Tayalisi, no. 1966.There are also narrations on this subject from Jabir [Bukhari, no. 6558, Muslim, no. 191, and Ahmad, 3/325], Abu Saeed [to come, no. 2598], and Imran bin Husayn [to come, no. 2600].