Start with this Du'a
Replying to "May Allah (SWT) forgive you"
وَلَكَ
Wa lak.
“And you too.”
Sahih Muslim 2346
The Prophet's ﷺ reply when 'Abdullah ibn Sarjis said to him, May Allah (SWT) forgive you.
Find your dua
Duas for replying to "may allah forgive you".
Return the du'a in kind
When a Companion said to the Prophet ﷺ, "May Allah (SWT) forgive you", he answered simply by returning the du'a.
1 sourced Du'a Arabic, transliteration, meaning, and source