LXX Joshua 1:7a & 8a
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ἴσχυε οὖν καὶ ἀνδρίζου... καὶ οὐκ ἀποστήσεται ἡ βίβλος τοῦ νόμου τούτου ἐκ τοῦ στόματός σου, καὶ μελετήσεις ἐν αὐτῷ ἡμέρας καὶ νυκτός, ἵνα συνῇς ποιεῖν πάντα τὰ γεγραμμένα·
That said, the practice of reading silently did not really become a 'thing' until the Renaissance period, with the rise of the printing press and the standardization of spaces between words. When Philip met the Ethiopian eunuch, he heard him reading from the prophet Isaiah.
When reading writing with no spaces between words, and with individual words broken between lines (but without the use of hyphens), you pretty well had to sound the text all out aloud to determine where the word breaks came.
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