To χάρις ὑμῖν οὕτω τίθησιν κτλ. → Thus he writes joy to you all, etc. (Cramer's Catena on 1 Thessalonians 1.1)
subs.
Receiving a share: P. μετάληψις, ἡ.
Giving a share: P. μετάδοσις, ἡ (Xen.).