14,000 infants (Holy Innocents) slain by Herod in Bethlehem

Reading from the Synaxarion:

The infant-slaying Herod mentioned here is the same one that ruled at
the time of Christ's Nativity. In those days, certain Magi, who were
wise and noble men, perhaps even kings, set forth from the East, and
came to Jerusalem, seeking the King of the Jews, Who had been born;
and they said that in the East, where their homeland was, an unusual
and strange star had appeared two years before, which, according to
an ancient oracle (Num 24:17), was to signify the birth of some
great king of the Jews. "For we have seen His star in the east," they
said, "and have come to worship Him" (Matt. 2:2). Hearing these things,
Herod was troubled, and the whole city together with him. Then, having
inquired and been informed by the high priests and scribes of the people
that, according to the prophecies, Christ was to be born in Bethlehem,
he sent the Magi thither and ordered them that, when they would find
the Child, to inform him, so that he also - as he affirmed - might go
and worship Him. But the Magi, after they had worshipped, departed by
another way to their own country by a divine command. Then Herod was
wroth and sent men to slay all the infants of Bethlehem and the parts
round about, from two years old and under, thinking that with them he
would also certainly slay the King Who had been born. But this vain man
who fought against God was mocked, since Jesus the Child, with Mary
His Mother, under the protection of Joseph the Betrothed, fled into
Egypt at the command of an Angel. As for those innocent infants, they
became the first Martyrs slain in behalf of Christ. But their
blood-thirsty executioner, the persecutor of Christ, came down with dropsy
after a short time, with his members rotting and being eaten by worms,
and he ended his life in a most wretched manner.

Apolytikion in the First Tone
Be entreated, O Lord, by the sufferings endured for You by the
Saints, and we pray You, heal all our pain.

Kontakion in the Plagal of the Second Tone
When the King was born in Bethlehem, the Magi arrived from the East
with gifts guided by a Star on high, but Herod was troubled and mowed
down the children like wheat; for he lamented that his power would
soon be destroyed.