1:3a Whoever among you belongs to His people,

As for any people among you (plur.) who are his people,
-or-
Concerning any of you (plur.) who belong to Yahweh,

1:3b may his God be with him,

may their God bless them.
-or-
I wish/pray that your (plur.) God will help you.

1:3c and may he go to Jerusalem in Judah

I give them permission to go up to Jerusalem of/in Judah
-or-
You (plur.) may go to Jerusalem.

1:3d and build the house of the LORD, the God of Israel; He is the God who is in Jerusalem.

to build a temple for Yahweh. He is the God of Israel, the God who dwells in Jerusalem.
-or-
You (plur.) will build a house where Yahweh/he, the God of the people of Israel, can be worshiped.

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