Originally Posted by Theophilus

For the marriage itself ?
Agape love, commitment, respect, purity and submission.

For the marriage ceremony?
An expression, before witnesses, of commitment to each other in marriage. . There were some requirments under Jewish law (but we are not under Jewish Law)
There are state and local government obligatins but this the only biblical one. It is more implied than expressed, but the precept is there exampled in the accounts of the marriages of Boaz and Ruth, Joseph and Mary.
Sincerely
Cliff