True meaning of istighfār in Islam
Nahj al-Balāgha|Volume 1|Book 3|Chapter 417
وَالثَّالِثُ: أَنْ تُؤَدِّيَ إِلَى الْـمَخْلُوقِينَ حُقُوقَهُمْ حَتَّى تَلْقَى اللهَ عزّوجلّ أَمْلَسَ لَيْسَ عَلَيْكَ تَبِعَةٌ.
the third is to discharge all the rights of people so that you may meet Allāh quite clean with nothing to account for;