Chapter 39: The Book on the Description of Hellfire
From Anas, that the Messenger of Allah (s. a. w) said – Hisham (one of the narrators) narrated it: “Some will exit the Fire,” Shu 'bah (another narrator) narrated it: 'Remove from the Fire whoever said La ilaha illallah and had good in his heart equal to the weight of a grain of barley. Remove from the Fire anyone who said La Ilaha illallah and had good in his heart equal to the weight of a grain of wheat. Remove from the Fire anyone who said La ilaha illallah and had good in his heart equal to the weight of a speck.” And Shubah said: “What is equal to the weight of a light piece of corn.” (Sahih) Other chains report similar narrations.
Jami at-Tirmidhi 2593