ק֚וֹל אֹמֵ֣ר קְרָ֔א וְאָמַ֖ר מָ֣ה אֶקְרָ֑א כָּל־הַבָּשָׂ֣ר חָצִ֔יר וְכָל־חַסְדּ֖וֹ כְּצִ֥יץ הַשָּׂדֶֽה׃
Une voix dit: "Proclame!" Et on a répondu: "Que proclamerai-je?" "Toute chair est comme de l’herbe, et toute sa beauté est comme la fleur des champs.
Radak
ראה, an imperative mode; who was this addressed to? This was not addressed to a specific person, but it is a mode of speech addressed to anyone who considers what follows as pertinent to himself. We have a similar usage of the imperative not being addressed to someone specific in Jeremiah 13,18 אמר למלך ולגבירה, as well as in Isaiah 60,6 קול אומר קרא!, “a voice says: call out!” No specific person is addressed by this proclamation. Similarly, in Isaiah 35,3 חזקו ידים רפות. Also in verse 4 of that chapter we encounter a similar construction.