Dua when consoling someone

أَعْظَمَ اللهُ أَجْرَك ،وَأحْسَنَ عَزَاءَك ، وَغَفَر لِمَيتكَ

Atham Allahu Ajrak Wa Ahsana Azaak Wa Ghafara Limay-yatik

May Allah magnify your reward, Make better your solace and forgive your deceased.