Multiple realities
(covers information from several alternate timelines)

Marriage vows were promises exchanged during a wedding ceremony spoken to validate a marriage.

In an alternate timeline, where Enterprise NX-01 was thrown back in time to the year 2037, where Charles Tucker III and T'Pol were wed, prime-Tucker learned from his son Lorian, that it took him weeks to learn to pronounce the vows in what was a traditional Vulcan ceremony. (ENT: "")

In an alternate timeline, where the USS Defiant was thrown back in time to the 22nd century, where Worf and Jadzia Dax were wed, prime-Dax learned from her great-grandson Yedrin Dax, that Dax would never forget Worf's voice as he said his vows, because it was shaking. (DS9: "Children of Time")

Immediately following the marriage of Rom and Leeta, Rom insisted that Leeta had to leave Deep Space 9 alone, much to her dismay. When she learned that Rom was staying, she was adamant that she was staying aboard as well, to which Rom said as an aside to his son, "You see that, Nog? We've barely finished saying our vows and we're already having our first fight." (DS9: "Call to Arms")

Worf explained to Jadzia Dax, that for their upcoming wedding, "When we exchange our vows, you must present your d'k tahg to General Martok as a formal request for him to accept you into our House." (DS9: "Sons and Daughters")

An example of a more traditional wedding ceremony, between Benjamin Sisko and Kasidy Yates, Vice Admiral William Ross explained to the couple that "these rings are a symbol of your love for each other, and the promise to abide by the vows you've made today," to which responded with placing the corresponding rings on each others' finger, while stating, "With this ring, I thee wed." (DS9: "'Til Death Do Us Part")

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