-اَللَّهُمَّ ا غْفِرْ لِيْ جِدِّي وَ هَزْلِيْ

Allaahummagh-fir lii jiddii wa hazlii

O Allah, forgive my sins that I committed earnestly and those that I committed in jest.

Ameen

This is du’aa #48 in Mawlana Ashraf ‘Ali Thanawi’s Munajat-e-Maqbul (translated as the Accepted Whispers by Khalid Baig) and is listed under the Saturday collection of daily du’aas.