A few verses from the Bible about gathering together:
Psalms 50:5 – Gather my saints together unto me; those that have made a covenant with me by sacrifice.
Matthew 12:30 – He that is not with me is against me; and he that gathereth not with me scattereth abroad.
Matthew 18:20 – For where two or three are gathered together in my name, there am I in the midst of them.
Acts 2:1 – And when the day of Pentecost was fully come, they were all with one accord in one place.
1 Corinthians 14:33 – For God is not [the author] of confusion, but of peace, as in all churches of the saints.
Colossians 3:16 – Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord.
Hebrews 10:24 – And let us consider one another to provoke unto love and to good works:
Hebrews 10:25 – Not forsaking the assembling of ourselves together, as the manner of some [is]; but exhorting [one another]: and so much the more, as ye see the day approaching.
Hebrews 12:1 – Wherefore seeing we also are compassed about with so great a cloud of witnesses, let us lay aside every weight, and the sin which doth so easily beset [us], and let us run with patience the race that is set before us,