The first part of this Chapter describes the end time, as evidenced by the phrase, “in that Day.” Verses 7 is quoted in the New Testament as fulfilled in Christ’s betrayal.
In that Day – this expression, which also appears in verse 2, and 4, always identifies the Day of the LORD, beginning with the prophet Isaiah.
a spring opened – this spring is of course, the water of baptism that will cleanse the House of David, and the inhabitants of Jerusalem.
the names of the idols – this is the end time purification of New Jerusalem.
You speak lies in the name of YHVH – as in Zechariah 5:4, the flying scroll that enters the house of “everyone who swears falsely by My name.”‘
I am no prophet – only the Word of God will prevail, that is the revelation of God, through the Bible. See also Deuteronomy 18:15-22, “the LORD your God will raise up for you a Prophet like me in your midst”. . . “but the prophet who presumes to speak a word in My name . . . shall die.”