Say "As-salamu alayna wa ala ibadillahi's-saliheen" when entering an unoccupied house.

This hadith teaches us that when we enter an unoccupied house, we should greet the occupants with peace and blessings. We should say “As-salamu alayna wa ala ibadillahi's-saliheen” which translates to “Peace be upon us and on the slaves of Allah, who are salih”. This is a way of showing respect for those who may be in the house as well as for Allah himself. It also shows that we are mindful of our actions and words when entering someone else’s space. By saying this phrase, we are wishing peace upon ourselves as well as those around us.