Therein (εν ταυτη). That is, "in faith," feminine demonstrative referring to πιστις.

The elders (ο πρεσβυτερο). More nearly like "the fathers," not the technical sense of elders (officers) usual in the N.T., but more like "the tradition of the elders" (Mark 7:3; Mark 7:5; Matthew 15:2).

Had witness borne to them (εμαρτυρηθησαν). First aorist passive of μαρτυρεω (cf. Hebrews 7:8), "were testified to."