Dua of Adam (A.S) in repentance:
رَبَّنَا ظَلَمْنَا أَنفُسَنَا وَإِن لَّمْ تَغْفِرْ لَنَا وَتَرْحَمْنَا لَنَكُونَنَّ مِنَ الْخَاسِرِينَ
"Rabbana thalamna anfusana wain lam taghfir lana watarhamna lanakoonanna mina alkhasireena"
"Our Lord! We have wronged ourselves. If You forgive us not, and bestow not upon us Your Mercy, we shall certainly be of the losers."
Al-Qur'an, 007.023 (Al-Araf [The Heights])
Dua of Ibrahim(Abraham) A.S for forgiveness for his parents:
"Rabbana ighfir lee waliwalidayya walilmumineena yawma yaqoomu alhisabu"
"Our Lord! Forgive me and my parents, and (all) the believers on the Day when the reckoning will be established."
Dua of Musa (A.S) :
رَبِّ إِنِّي لِمَا أَنزَلْتَ إِلَيَّ مِنْ خَيْرٍ فَقِيرٌ
"rabbi innee lima anzalta ilayya min khayrin faqeerun"
"My Lord, indeed I am, for whatever good You would send down to me, in need."
Dua of Musa (Moses) A.S for good speech, when he was sent by Allah to Pharaoh:
"O my Lord! Open for me my chest (grant me self-confidence, contentment, and boldness).
"And ease my task for me;
"And make loose the knot (the defect) from my tongue, (i.e. remove the incorrectness from my speech)
"That they understand my speech ”
“rabbi ishrah lee sadree .Wayassir lee amree .Waohlul AAuqdatan min lisanee
Yafqahoo qawlee ”
Dua of Yunus (A.S) repenting: (21:87)
َّا إِلَهَ إِلَّا أَنتَ سُبْحَانَكَ إِنِّي كُنتُ مِنَ الظَّالِمِينَ
"la ilaha illa anta subhanaka innee kuntu minaz zalimin"
“La ilaha illa Anta [none has the right to be worshipped but You (O Allah)], Glorified (and Exalted) are You [above all that (evil) they associate with You]. Truly, I have been of the wrong-doers."
Al-Qur'an, 21:87 (Al-Anbiya [The Prophets])
Dua of Yusuf (Joseph) A.S :
"fatira alssamawati waalardi anta waliyyee fee alddunya waalakhirati tawaffanee musliman waalhiqnee bialssaliheena"
“The (only) Creator of the heavens and the earth! You are my Wali (Protector, Helper, Supporter, Guardian, etc.) in this world and in the Hereafter, cause me to die as a Muslim (the one submitting to Your Will), and join me with the righteous."