The Catechism in Questions & Answers

671. What is a wedding blessing?

The wedding blessing is a blessing that is dispensed after a civil marriage ceremony.
The partners are asked whether they intend to stand by each other in faithfulness under all circumstances and pursue their path of life together in love. Both of them vow this before God and the congregation by saying yes. Thereupon they receive the blessing of the triune God. The blessing is intended to help them keep this vow, to lead their life together in harmony, and master difficult situations with God’s help.