Luke records that Jesus told people to share what they saw/heard.
Luke 7:22 (Codex Sinaiticus)
English: And he answered and said to them: Go tell John what things you have seen and heard, that the blind receive sight, the lame walk, lepers are cleansed, the deaf hear, the dead are raised, the poor have the gospel preached to them; Greek: και αποκριθειϲ ει πεν αυτοιϲ πορευ θεντεϲ απαγγι λατε ϊωαννει α ει δετε και ηκουϲατε τυφλοι αναβλεπουϲι χωλοι περιπατουϲι λεπροι καθαριζονται και κωφοι ακουουϲι