Of the guest for the host1 du'a
O Allah, bless them in what You have provided for them, and forgive them and have mercy on them.
اللّهُـمَّ بارِكْ لَهُمْ فيما رَزَقْـتَهُم وَاغْفِـرْ لَهُـمْ وَارْحَمْهُمْ
"O Allah, bless them in what You have provided for them, and forgive them and have mercy on them."