Sahih Muslim 128b

Yahya ibn Ayyub, Qutaybah, and Ibn Hujr narrated to us; they said: Isma'il—that is, Ibn Ja'far—narrated to us, from al-Ala, from his father, from Abu Hurayrah, from the Messenger of Allah (peace and blessings be upon him), who said that Allah, Mighty and Majestic, said: ‘When My servant intends to do a good deed but does not do it, I record one good deed for him. If he does it, I record it as ten good deeds, up to seven hundred times. When he intends to do an evil deed but does not do it, I do not record it against him; if he does it, I record one evil deed.’