اللَّهُمَّ بَارِكْ لَهُمْ فِيمَا رَزَقْتَهُمْ، وَاغْفِرْ لَهُمْ وَارْحَمْهُمْ
Allahumma barik lahum fima razaqtahum, waghfir lahum warhamhum
Oh Allah, bendícelos en lo que les has provisto, perdónalos y ten misericordia de ellos.
Dua for the host when being a guest
Making dua for those who host you is from the sunnah.