Hadith Qudsi 16:

Narrated Ibn Abbas:  Among the sayings of the Messenger of Allah that he related from his Lord Almighty is that he said:

Allah has written down the good deeds and the bad ones. Then He explained it [by saying that] 'he who has intended a good deed and has not done it, Allah writes it down with Himself as a full good deed, but if he has intended it and has done it, Allah writes it down with Himself as from ten good deeds to seven hundred times, or many times over. But if he has intended a bad deed and has not done it, Allah writes it down with Himself as a full good deed, but if he has intended it and has done it, Allah writes it down as one bad deed.'

It was related by al-Bukhari and Muslim.