Mark 10:8

8 and they shall be twain in one flesh. And so now they be not twain, but one flesh. [and they shall be two in one flesh. And so now they be not two, but one flesh.]

Mark 10:8 Meaning and Commentary

Mark 10:8

And the twain shall be one flesh
This is the remaining part of the citation out of ( Genesis 2:24 ) ; (See Gill on Matthew 19:5);

so then they are no more twain; but one flesh;
as Adam and Eve were both by creation and marriage: and so two persons, a man and woman, being lawfully married together, become one flesh, or "one body", as the Arabic and Persic versions render the phrase; and therefore the wife is to be loved by the husband as his own body, and from whom there should be no separation, until death, but in case of adultery; (See Gill on Matthew 19:6).

Mark 10:8 In-Context

6 But from the beginning of creature God made them male and female;

7 and said, For this thing a man shall leave his father and mother, and shall draw to his wife [and shall cleave to his wife],

8 and they shall be twain in one flesh. And so now they be not twain, but one flesh. [and they shall be two in one flesh. And so now they be not two, but one flesh.]

9 Therefore that thing that God hath joined together, no man separate [no man part].

10 And again in the house his disciples asked him of the same thing.