Allah (SWT) is The Forgiver. The Prophet (SAWA) and Ahlul Bayt (AS) taught us to supplicate to Allah: O Allah, who no one forgives sins but He يا من لا يغفر الذنب إلا هو
This part of Du'a Jawshan al-Kabeer which we recite during month of Ramadhan and other occasions.
We seek the Shafa'ah (intercession) from the Prophet (SAWA) and Ahlul Bayt (AS) to Allah (SWT) to forgive our sins.
Wassalam.