Al-Adab Al-Mufrad #413

Abu Hurayra reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "The gates of the Garden are opened on Mondays and Thursdays. Every person who does not associate anything with Allah is forgiven except for someone who has enmity between existing between him and another man. It is said, 'Leave these two until they make peace.'"