Mattityahu 9:14-15

Then Yochananʼs talmidim approached Rebbe, Melech HaMoshiach, saying, Why do we and the Perushim often undergo tzomot (fasts), but your talmidim do not undergo tzomot? And Moshiach said to them, Surely the Bnei HaChuppah (wedding invitees) are not able to act as avelim (mourners) as long as the Choson (Bridegroom), is with them. But the days will come when the Choson is taken away from them, and then they will undergo tzomot.