In the name of Allah, Most Gracious, Most Merciful.
Abu Dharr (May Allah be pleased with him) reported: The Prophet (May Allah exalt his mention and protect him from imperfection) said: “Allah, the Almighty, says: ‘Whosoever does a good deed, will have (reward) ten times like it and I add more; and whosoever does an evil, will have the punishment like it or I will forgive (him); and whosoever approaches Me by one span, I will approach him by one cubit; and whosoever approaches Me by one cubit, I approach him by one fathom, and whosoever comes to Me walking, I go to him running; and whosoever meets Me with an earth-load of sins without associating anything with Me, I meet him with forgiveness like that”. (Muslim)
This Hadith mentions the infinite Compassion and Mercy of Allah to His obedient slaves and a special expression of which will be made by Allah on the Day of Resurrection. On that Day, Allah will give at least ten times reward for each good deed. In some cases it may be far more than that, seven hundred times or more, as He would like. Such benevolence on Allah’s part warrants that a Muslim should never lose hope of His forgiveness.
Riyaadiss-Saliheen (The Meadows of the Righteous)
By Imam An Nawawi
Chapiter 51, Page 139, No 413