Is Once Enough?

Is once enough? That is, is it enough to attend church once on Sunday? Scripture does not specifically state that we should attend twice. So why go twice? Is this required and necessary? No one should dispute the fact that poor church attendance is a sin. The Scriptures make this clear, for example, in Hebrews 10:25. There we are admonished "not to forsake the assembling of ourselves together, as the manner of some is." Obviously there were those, already in the early New Testament church, who...