I think there is something in Gen. 2 that relates to a man leaving his father and mother.
What, (if anything), happened in Genesis 2 that relates to a man leaving his father and mother?
Gen. 2 talks about how there was no partner found for Adam, so God makes a partner out of Adam himself, and this being is a perfect compliment to Adam - in effect, God splits Adam out into two beings, and when the two beings are put together again then they become one. So, for this reason - because a man and a woman are only "half" a being without each other - a man leaves his family and joins to his wife and they become one being.
Thanks Luke. I guess the practical reasons behind this verse are as you have pointed out.
Perhaps I should be a bit clearer about my initial question, and my subsequent post.
Understanding that Jesus cites this passage in relation to practical things as already pointed out, Paul in Ephesians 5 uses the same verse but "speaks concerning Christ and the ecclesia". There is therefore the surface (practical) meaning, but also an underlying layer.
The union of the first man and woman is a type of the union between Christ and his bride in the future - largely a well-known concept. Therefore the events of Genesis 2 are a foreshadowing of that future marriage.
I guess the first question I should have asked is: In what way does Genesis 2:24 relate to Christ? How does he, the fulfillment of the type, the true man created in God's image, "leave his father and mother"?
Perhaps to understand this, the relevance of Genesis 2:24 in its own context would help...hence, the initial question.
The concept of the 'ground', (Heb. the 'adamah' - related to man, 'adam'), symbolising the nature of man is one which I am currently trying to understand and am exploring. Bro Andrew Perry's book 'Beginnings and Endings', (an excellent book!), deals with this extensively, but more in relation to Genesis 3, "cursed in the ground for thy sake", demonstrating that the ground which was cursed, naturally bringing forth thorns and thistles, is a symbol for the sin-prone nature we have.
As an extention of this, I have wondered whether the emphasis of Gen2 concerns the 'ground' and what was made out of the ground, (i.e. man), and whether, in type, it refers to Jesus, the man, leaving his natural heritage, the ground (human sin-prone nature), to be joined to his bride. The only way we can leave the ground is by following his example, ("forget also thine own people, and also thy father's house" - Psalm 45:10), and by being formed "out of" Jesus, to be a helper, "as before him", i.e. in his image.
I would appreciate any comments as I'm dubious of trusting my own thoughts!