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When we read that "salvation has come upon this house", it is NOT to be understood as meaning, that every single individual was given salvation. But rather, that the salvation which was given to those who believed, came into that house(hold).
I agree.....and this is where I desired PJ to go with it. But, the NT is very strict here not JUST saying that salvation came to an individual, but that it came to his house. IMHO this is for a specific reason to reveal that the covenant came to the house, not just the individual. As you said, not that everyone in the house is saved--that would be utter nonsense, but that certain blessing do come upon the household. What blessings IMHO are clearly seen in the OT/NT.

Reformed and Always Reforming,