رَبَّنَا أَصْلِحْ بَيْنَنَا، وَاهْدِنَا سَبِيلَ الْإِسْلَامِ، وَنَجِّنَا مِنَ الظُّلُمَاتِ إِلَى النُّورِ، وَاصْرِفْ عَنَّا الْفَوَاحِشَ مَا ظَهْرَ مِنْهَا وَمَا بَطَنَ، وَبَارِكْ لَنَا فِي أَسْمَاعِنَا وَأَبْصَارِنَا وَقُلُوبِنَا وَأَزْوَاجِنَا وَذُرِّيَّاتِنَا، وَتُبْ عَلَيْنَا إِنَّكَ أَنْتَ التَّوَّابُ الرَّحِيمُ، وَاجْعَلْنَا شَاكِرِينَ لِنِعْمَتِكَ، مُثْنِينَ بِهَا، قَائِلِينَ بِهَا، وَأَتْمِمْهَا عَلَيْنَا

Rabbanaa aslih baynanaa wahdinaa sabiilal islaam, wa najjinaa minadh dhulumaati ilaannur wasrif ‘annaal fawaa’hisha maa dhahraa minhaa wa maa batana wa baarik lanaa fii asmaa-’inaa wa absaarinaa wa quluubinaa wa azwaajinaa wa dhurriyyaatinaa wa tub ‘alainaa innaka antat tawwabur rahiim waj’alnaa shaakiriinaa lini’matika muth niina bihaa qaa-iliina bihaa wa atmimhaa ‘alainaa

Our Lord, make peace between us and guide us on the path of Islam. Save us from the darkness (and bring us) to the light. Remove acts of deviance from us, both open and hidden. Bless us in our ears, our eyes, our hearts, our wives and our children. Turn to us. You are the Ever-Turning, Most Merciful. Make us thankful for Your blessing and make us among those who give praise for it and proclaim it. Perfect it for us. Narrated Abdullah ibn Mas'ud (RA): We did not know what we should say when we sat during prayer. The Messenger of Allah (ﷺ) was taught (by Allah). He then narrated the tradition to the same effect. Then He said: He used to teach us also some other words, but he did not teach them as he taught us the tashahhud: (The dua is mentioned above)

Reference: Sahih. Sahih Adabul Mufrad: 630