Istighfar

• أسْتَغْفِرُ اللَّهَ وَ أتُوبُ إلَيْهِ

"Astaghfirullaha wa atūūbu ilai(hi)"

(I seek the Forgiveness of Allah and repent to Him.)

[to be reicted 100 times during the day] 

[Sahih al Bukhari, Muslim 4:2075]

• "La-ilaha Illallahu Wahdahu La-shareeka Lahu; Lahul Mulku Wa Lahul Hamdu; Wa Huwa A'la-kulli Shai'in Qadee'r."

• "Astagfirullaha Rabbi Min Kulli Zambi Wa Atubu Ilaihi La Haula Wala Quata Illa Billahil Ali-wil azeem."

• "Allahumma Innaka Afu'un Tahib-bul Afwa fa-fu anni."

[to be recited during Ramadan]

• لَّا إِلَهَ إِلَّا أَنتَ سُبْحَانَكَ إِنِّي كُنتُ مِنَ الظَّالِمِينَ

"La illaha illa Anta Subhanak, inni kuntu min adh-dhalimeen"
(There is no God but You;   Glory be to You, Truly I have been one of the wrongdoers)
[Surah al-Anbiyah, 21: 87]