I made a promise

Hail and well-met fellow travelers,

I am having such a time trying to translate this phrase ( "I made a promise") into sindarin. I struggle with language and I don't know how this might be worded. My partner and I are hoping to get tattoos together, but didn't want to just have the English words in the script. If anyone has any time to help it would be so very appreciated. All my best,

Elektra