John Gill Commentary Mark 6:10

"And he said unto them, Wheresoever ye enter into a house, there abide till ye depart thence." — Mark 6:10 (ASV)

And he said to them
He continued giving orders and directions to them, saying,

in whatever place you enter into a house, there stay until you
depart from that place :
that is, in whatever city or town they should come to, the first house they went into, they should continue in, during their stay in that city or town, and not shift from house to house; (See Gill on Matthew 10:11).