Первом

39 сиде́ть впереди́ в синаго́гах и возлежа́ть на первом [ме́сте] на пи́ршествах,

39 sit ahead [at, in, of, on] synagogues and recline [at, by, in, it, on the, to, toward, upon] первом [location] [at, by, in, it, on the, to, toward, upon] feasts,

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and have the best seats in the synagogues and the places of honor at feasts,
Mark 12:39 ESV

And the chief seats in the synagogues,
and the uppermost rooms at feasts:
Mark 12:39 KJV