'Assembly' in the Bible

(but if a man doesn't know how to rule his own house, how will he take care of the assembly of God?)

but if I wait long, that you may know how men ought to behave themselves in the house of God, which is the assembly of the living God, the pillar and ground of the truth.

If any man or woman who believes has widows, let them relieve them, and don't let the assembly be burdened; that it might relieve those who are widows indeed.