'Necessary' in the Bible

And now, though we share the same flesh and blood as our fellow countrymen, and our children are just like their children, still we have found it necessary to subject our sons and daughters to slavery. Some of our daughters have been subjected to slavery, while we are powerless to help, since our fields and vineyards now belong to other people."

And I said, What you are doing is not good: is it not the more necessary for you to go in the fear of our God, because of the shame which the nations may put on us?