# Who will ascend the mountain ... in his holy place?

Both of these questions mean basically the same thing. The speaker is asking about who is allowed to go and worship Yahweh. (See: [[rc://en/ta/man/translate/figs-parallelism]])

# will ascend

"will go up" or "will climb"

# the mountain of Yahweh

This refers to Mount Zion in Jerusalem.

# his holy place

This refers Yahweh's temple. His temple is on Mount Zion in Jerusalem.