Allaahum-maghfir lee maa qaddamatu, wa maa ‘akhkhartu ..

Seeking Allaah’ forgiveness  after the last tashahhud and before salam

Allaahum-maghfir lee maa qaddamatu, wa maa ‘akhkhartu, wa maa ‘asrartu, wa maa a’lantu, wa maa ‘asraftu, wa maa ‘Anta a’lamu bihi minnee. ‘Antal-Muqaddimu (The One Who brings forward) wa ‘Antal-Mu’akhkhiru (The One Who puts back)laa ‘ilaaha ‘illaa Anta.
[Muslim 1/534]

“O Allah, forgive me for those sins which have come to pass as well as those which shall come to pass, and those I have committed in secret as well as those I have made public, and where I have exceeded all bounds as well as those things about which You are more knowledgeable. You are Al-Muqaddim and Al-Mu-akhkhir. None has the right to be worshipped except You.”

Note : al-Muqaddim (The One Who brings forward) , al-Mu’akhkhir (The One Who puts back) are the two names of Allaah