The answer is: Isaiah

Isa 20:2-3

Now, isn't that an intriguing image to start your day? The prophet Isaiah, possibly the most famous of the major prophets, receiving a rather peculiar command from the Lord to walk around barefoot and naked for three whole years! In Isaiah 20:2-3, it states that God instructed him to do this as a vivid and shocking form of prophecy against Egypt and Cush. Talk about a bold message!

This act wasn’t just about the physical state of Isaiah; it symbolized the humility and vulnerability of those nations. Israel’s prophetic actions often packed a figurative punch; think of Ezekiel lying on his side for days to symbolize an impending siege. Often these bizarre or 'eccentric' commands served to call attention to God's messages in a world that had grown increasingly numb to spiritual truths.

Interestingly, ancient cultures took prophets seriously, often considering them to be direct voicing of divine will. You can imagine the eyebrows raised at Isaiah's unconventional method of prophecy! Shoes in the ancient Mediterranean world held social and religious significance. Walking barefoot was a sign of mourning or captivity, resonating deeply with Isaiah’s message about the impending suffering poised over those nations.

So, while Isaiah stepped out with only his birthday suit, he was shouting a loud and clear warning through his behavioral prophecy, teaching us how sometimes, breaking norms can be the loudest way to get our attention to significant spiritual shifts ahead.