Reference : Hisn al-Muslim 182

اللّهُـمَّ بارِكْ لَهُمْ فيما رَزَقْـتَهُم، 
وَاغْفِـرْ لَهُـمْ وَارْحَمْهُمْ
Allāhumma bārik lahum fī mā razaqtahum, 
wagh’fir lahum warḥamhum.


O Allah, bless them in what You have provided for them, 
and forgive them and have mercy on them.

Reference:
Muslim 3/1615.

Chapter: Of the guest for the host