Wazifa for forgiveness after committing sin

رَبَّنَا ظَلَمْنَا أَنْفُسَنَا وَإِنْ لَمْ تَغْفِرْ لَنَا وَتَرْحَمْنَا لَنَكُونَنَّ مِنَ الْخَاسِرِينَ

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They said: "our Lord! we have wronged our own souls: if Thou forgive us not and bestow not upon us Thy mercy we shall certainly be lost."

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Pray after every Prayer.