en_tn_condensed/isa/48/12.md

Yahweh continues speaking to the people of Israel.

Jacob, and Israel, whom I called

Both of these refer to the people of Israel. (See: rc://en/ta/man/translate/figs-doublet)

I am the first, I also am the last

See how you translated this in Isaiah 44:6.

my hand...my right hand

Here "hand" refers to Yahweh. (See: rc://en/ta/man/translate/figs-synecdoche)

the foundations of the earth

See how you translated this in Isaiah 24:17.

spread out the heavens

See how you translated a similar phrase in Isaiah 42:5.