It appears the 'live coal' is a reference to the 'word of God' - If you look at the attached link, scroll down past the different translations to the commentaries.
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It could mean the geological spread of coal seams in the ground. Or it could mean the process of getting the coal from the mines to the consumers.
Isaiah means "Yahweh is Salvation." The Book of Isaiah is often referred to as the Gospel according to Isaiah. Isaiah is the first of the Major Prophets in the English Bible.
These verses deal with the spiritual and literal rebuilding of Jerusalem and Israel.
Abbreviation for Isaiah is Isa.
Isaiah 39:8 KJVThen said Hezekiah to Isaiah, Good is the word of the LORD which thou hast spoken. He said moreover, For there shall be peace and truth in my days.Hezekiah is pleased to know that the things that Isaiah has just told him, the word of the LORD, or specific word for word quote of what the LORD (Yahweh) said to say to Hezekiah, will not happen while Hezekiah is still alive, "in my days".