> og veita þér slíkt lið sem eg má mér
> (why not sér, reflexive?) við koma."

Because it's 1st person. 'sér' is a 3rd person pronoun, and only the
3rd person has distinct reflexive forms. In the 1st and 2nd persons, the
regular pronouns are used reflexively, rather than there being any
special reflexive forms.