Want reward for Fasting & Tahajjud even without doing them??
Be good to people before you think of doing extra worship because violating Huqooq al-ibaad (rights of people) will not be forgiven by Allah!
Prophet Muhammad (saws) said, “The real bankrupt of my Ummah would be he who would come on the Day of Resurrection with SALAT (prayer), SAUM (fasting) and SADAQAH (charity), (but he will find himself bankrupt on that day as he will have exhausted the good deeds) because he insulted someone, spread false stories about someone, unlawfully devoured the wealth of someone, shed the blood of someone and beat someone; so his good deeds would be credited to the account of those (who suffered at his hand). If his good deeds fall short to clear the account, their sins would be entered in his account and HE WOULD BE THROWN IN THE (HELL) FIRE.”[Muslim]