Now, brothers, concerning the coming of our Lord Jesus Christ, and our gathering together to him, we ask you
and by our gathering together unto him: The Greek word episunagogee is used in the New Testament of "a gathering together in one place" (Thayer 244-1-19971). This form of this word is used only twice, once in this passage and the other time in Hebrews 10:25, which states: "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." There is a day set aside by God the Father when we will all assemble with Him. Until that day comes, we should regularly assemble ourselves together with the saints.