Mukhtasar Bukhari

Narrated by Sayyiduna Anas (may Allah be pleased with him) from the Noble Prophet (peace and blessings of Allah be upon him) that he said: "Whoever says 'La ilaha illallah' and in his heart there is goodness (i.e., faith) equal to a grain of barley, he will come out of Hell. Whoever says 'La ilaha illallah' and in his heart there is goodness (i.e., faith) equal to a grain of wheat, he will come out of Hell. And whoever says 'La ilaha illallah' and in his heart there is goodness (i.e., faith) equal to the smallest particle, he will come out of Hell."