# You have said

"Your people said". The word "You" refers to the mountain of Seir. Ezekiel is to speak to the mountain as if it can hear him. The message is for the people of Edom.

# these two lands

"the lands of Israel and Judah"

# will become mine

"will become ours".

# we

The word "we" refers to the people of Edom.

# even when Yahweh was present with them

"but Yahweh was there protecting Israel and Judah"