Закрыты

52 Ведь они́ не по́няли и чу́да с хлебами –– их сердца бы́ли закрыты.

52 [Because, After All, Indeed] [they, they are] [never, not] [understand, understood] and [a miracle, miracle, sign] [and, from, in, of, with] bread –– [them, their] [heart, hearts, very heart] [been, has been, were] закрыты.

for they did not understand about the loaves,
but their hearts were hardened.
Mark 6:52 ESV

For they considered not the miracle of the loaves:
for their heart was hardened.
Mark 6:52 KJV