'Hand' in the Bible

and [when] James and Cephas and John--those thought to be pillars--acknowledged the grace given to me, they gave to me and Barnabas the right [hand] of fellowship, in order that we [should go] to the Gentiles and they to the circumcision.

Why then the law? It was added on account of transgressions, until the descendant should come to whom it had been promised, having been ordered through angels by the hand of a mediator.

See with what large letters I am writing to you with my [own] hand.