Through the same chain it is narrated that the Messenger of Allah (peace and blessings be upon him) said: "There is a sin that is not forgiven, a sin that is not left alone, and a sin that is forgiven. As for the sin that is not forgiven, it is associating partners with Allah; as for the sin that is forgiven, it is the servant's shortcoming in the right of Allah, the Mighty and Majestic; and as for the sin that is not left alone, it is the servants wronging one another."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6108