en_tn/gal/03/16.md

Now

This word shows that Paul has stated a general principle and is now beginning to introduce a specific case.

referring to many

"referring to many descendants"

to your descendant

The word "your" is singular and refers to a specific person, who is a particular descendant of Abraham (and that descendant is identified as "Christ"). (See: rc://en/ta/man/jit/figs-you)