اللَّهُمَّ بَارِكْ لَهُمْ فِيمَا رَزَقْتَهُمْ، وَاغْفِرْ لَهُمْ وَارْحَمْهُمْ
Allahumma barik lahum fima razaqtahum, waghfir lahum warhamhum
Ó Allah, abençoa-os no que lhes providenciaste, perdoa-lhes e tem misericórdia deles.
Dua for the host when being a guest
Making dua for those who host you is from the sunnah.