Look up this word
promise

In a sentence
Nikdy sa nestalo, že by nesplnil svoj sľub.
He never failed to keep his promise.
Dodržali svoj sľub.
They've kept their promise.
Musím ti pripomenúť tvoj sľub.
I have to remind you of your promise.
Musím vám pripomenúť váš sľub.
I have to remind you of your promise.
Examples from Tatoeba (CC BY 2.0 FR).
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Example sentences from Tatoeba (CC BY 2.0 FR).
Full attribution on References.