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  • Nawawi_36_Forgiveness_and_Repentance, page : 23

3. That he/she is determined never to practice it again.

If any of these three conditions is missing, the repentance is not
valid.

If the sin involves the rights of another human, then a fourth
condition will be added which is that he/she satisfies the rights of the
owner by, for example, returning his/her property, or presents
him/herself for the Islamic punishment, or obtains a pardon from the
injured party.

Therefore it is obligatory to repent from all sins. Although if he/she
repents from some it will be accepted, however, the remainder of
his/her unrepented sins, remain a burden for that person.

The obligation of repentance is obvious from the proofs found in the
Koran, the Prophetic ways and the collective opinion of Muslim
scholars.”