Dua' for the deceased

[Muslimah]

As Salam Alykom dearest Jennifer

U mean dua for one who passed away already.

Here u go:

Allahuma eghfer lahu/laha warahamhu/warhamha wa a`afehi waa`afu a`anhu wa akrem nuzulahu wawase`a mudkhalhu waeghslehu belma-a wathalaj walbarad wa naqehi minalkhataya kama naqayta athawabel abyad mina danas, wa ebdelhu daran khairan min dareh wa ahlan khayran min ahleh wa zawjan khayran min zawjeh wa adkhelhul jannata wa a`adhehu min adhabel qabr wa adhab ennar.

Translation:

Allahuma forgive him/ her and have mercy on him, and pardon him, bless the place where he shall decend, expand his entry, wahs him with water, ice and hail, purify him from sins just as You purified the white garment from dirt, replace his home with a better one, replace him household with a better one, his spouse with a better one, allow him entry to Jannah and protect him against torture of grave and hell fire.

Now we use this dua during Janazah prayer if u need more or anything else let me know.