A.T. Robertson Commentary Luke 2:17

"And when they saw it, they made known concerning the saying which was spoken to them about this child." — Luke 2:17 (ASV)

Made known (εγνωρισαν). To others (verse 18) besides Joseph and Mary. The verb is common from Aeschylus on, from the root of γινωσκω (to know). It is both transitive and intransitive in the N.T.