Дварим 5:5 Галаха: Mishneh Torah, Prayer and the Priestly Blessing

אָ֠נֹכִי עֹמֵ֨ד בֵּין־יְהוָ֤ה וּבֵֽינֵיכֶם֙ בָּעֵ֣ת הַהִ֔וא לְהַגִּ֥יד לָכֶ֖ם אֶת־דְּבַ֣ר יְהוָ֑ה כִּ֤י יְרֵאתֶם֙ מִפְּנֵ֣י הָאֵ֔שׁ וְלֹֽא־עֲלִיתֶ֥ם בָּהָ֖ר לֵאמֹֽר׃ (ס)

Я стоял между Господом и вами в то время, чтобы возвещать вам слово Господне; ибо вы боялись огня и не ходили на гору—говоря:

Mishneh Torah, Prayer and the Priestly Blessing

The person who reads may not do so till the chief member of the congregation invites him to do so. Even the appointed officer of the synagogue or its president does not read, at his own volition, but waits till the congregation or its chief member tells him to do so. And some one should stand at his side, while he is reading, just as the appointed officer stands at the side of other persons who read.