en_tn/dan/09/20.md

my people Israel

"the people of Israel to whom I belong"

the mountain of God's holiness

The word "holiness" here may refer to God's holy temple. Possible meanings are 1) “the mountain where God's holy temple is” or 2) “God's holy mountain." (See: rc://en/ta/man/translate/figs-metonymy)

in the vision at the first

This may refer to the first vision that Daniel had while he was awake. AT: "in the previous vision" or "in the vision I saw before" or "in a vision before"

at the time of the evening sacrifice

The Jewish people sacrificed to God each evening just before the sun goes down.