Tertullian

However, in regard to those who are betrothed, I can declare and avow this with more than my usual firmness: their heads should be covered from the day when they first trembled at the kiss and handclasp of their future husband. For in these symbols they have pledged every bit of themselves—their life throughout its full development, their flesh throughout their lifetime, their spirit through their understanding [of the contract], their modesty through the exchange of a kiss, their hope through their expectation and their mind through their willingness. For us, Rebekah stands as sufficient example; when her future husband had been pointed out to her, she covered her head with her veil merely because she knew she was to marry him.

The very vitals of Rebekah are stirred, though the child is a long way from birth and there is no breath of air. Behold, the twin offspring struggles in the womb of their mother, though there yet is no sign of the two nations. We might regard as prophetic this struggle of the two infants, who are at enmity even before they are born, who show animosity before animation, for their restlessness disturbed their mother. When, however, the womb is opened, their number known and the symbolic implications of their condition made manifest, we see clearly not only the separate souls of those children but even then the beginning of their rivalry.