'Assembly' in the Bible

(and if any one his own house how to lead hath not known, how an assembly of God shall he take care of?)

and if I delay, that thou mayest know how it behoveth thee to conduct thyself in the house of God, which is an assembly of the living God -- a pillar and foundation of the truth,

If any believing man or believing woman have widows, let them relieve them, and let not the assembly be burdened, that those really widows it may relieve.