וַיֹּ֤אמֶר יְהוָה֙ אֵלַ֔י אַל־תֹּאמַ֖ר נַ֣עַר אָנֹ֑כִי כִּ֠י עַֽל־כָּל־אֲשֶׁ֤ר אֶֽשְׁלָחֲךָ֙ תֵּלֵ֔ךְ וְאֵ֛ת כָּל־אֲשֶׁ֥ר אֲצַוְּךָ֖ תְּדַבֵּֽר׃
But the LORD said unto me: Say not: I am a child; For to whomsoever I shall send thee thou shalt go, And whatsoever I shall command thee thou shalt speak.
Read halakhic rulings (Jewish law) on Jeremiah 1:7: and classical halakhic sources.