'Fellowship' in the Bible

Now if perfection [a perfect fellowship between God and the worshiper] had been attained through the Levitical priesthood (for under it the people were given the Law) what further need was there for another and different kind of priest to arise, one in the manner of Melchizedek, rather than one appointed to the order of Aaron?

sometimes by being made a spectacle, publicly exposed to insults and distress, and sometimes by becoming companions with those who were so treated.

and of doing good, and of fellowship, be not forgetful, for with such sacrifices God is well-pleased.