Nouns ending in -oir are masculine.
The suffix often names a tool, place, or instrument.
Is revoir masculine or feminine?
lerevoir
The rule behind it
100% of -oir nouns are masculine
In context
J'ai hâte de vous revoir très bientôt.
I look forward to seeing you again very soon.
Elle a raccroché sans même dire au revoir.
She hung up without saying good-bye.
J'ai hâte de te revoir dimanche prochain.
I am looking forward to seeing you next Sunday.