Allahumma inna [name the person] fi dhimmatika, wa habli jiwaarika, faqihi min fitnaltil qabri, qa adhaban-naari, wa anta ahlul Wafaa'i wal-Haqqi. Faghfir lahu warhamhu. Innaka antal Ghafurur-Raheem

O Allah! Surely [name the person] is under Your protection, and in the rope of Your security, so save him from the trial of the grave and from the punishment of the Fire. You fulfill promises and grant rights, so forgive him and have mercy on him. Surely You are Most Forgiving, Most Merciful.
[Ibn Majah, abu Dawud 3:211]