This is something I've been wondering about for a while and which has come up a couple of times in my bible study group. Sadandisolated's thread about divorce in the Catholic church has made me wonder again, so I thought I'd ask here and see if anyone can answer my question!
Where, in the Bible, does it actually define what a marriage is? I've only ever seen it defined as a 'union between a man and a woman' and that a man / woman leaves his family and becomes one with his / her husband or wife. Is there a scriptural law that says that unless you have stood up, declared your fidelity to each other in front of others, had a priest / rabbi approve it, and sign a piece of paper, then is isn't a marriage? Or is the marriage ceremony simply a religious / social convention?
The question first came up when we were discussing the idea of 'living in sin' - a couple of the members of my group are not married, but have long-term partners and children together. To my mind, that constitutes a marriage - it's a partnership and a union between a man and a woman. Unless, of course, there is something in scripture that says we have to go through the marriage ceremony in order for a marriage to exist?
Can anyone tell me? Apologies if this is a really stupid question but I would really like to know!