person (who is repenting) will pledge never to repeat the sin which he committed, and (3) He will strive to rectify the loss done.
Sins which need repentance
The first type of sine which need repentance are those which are related to the person committing it only, and no other person having being effected by it. It's punishment is
reserved for the hereafter. For example, a man using gold, or wearing a silken dress. The repentance of this sin is that the person should repent sincerely and promise never to commit it again. This will become the reason for warding off Allah's wrath in Qayamat.
The second type of sins are those which are related to another person other than the one committing it. Again these are of two types (1) Huququllah (Rights of Allah),
and (2) Huququn Naas (Rights of men). If a man has usurped the property of someone, or has committed such a sin whose atonement is the freeing of a slave, and in spite of being capable of rectifying it, does not do so, he will not be forgiven. It is obligatory on him to pay the atonement. And if someone has not recited the obligatory Prayers or neglected fast, it is compulsory on him to perform it's elapsed (Qaza) In the case of rights of men, if a person has usurped someone's wealth, then he is compelled to return it