Answer: 1. Abandoning sin

2. Remorse for committing sin

3. Resolve not to return to sin

4. Restoring the rights to its owners

Allah Almighty says: {And those who, when they commit a shameful act or wrong themselves, remember Allah and seek forgiveness for their sins – who can forgive sins except Allah? – and they do not persist in what they did knowingly.} [Surat Āl ‘Imrān: 135]