Isaiah 20:2
At the same time spake the Lord by Isaiah the son of Amoz, saying, Go and loose the sackcloth from off thy loins, and put off thy shoe from thy foot. And he did so, walking naked and barefoot.
Cross-reference
Jeremiah 13:1-11 also uses a symbolic object lesson (the linen belt) to convey God's message, paralleling Isaiah's prophetic sign of going naked.
Ezekiel 24:17 commands the prophet to keep his sandals on as a sign of not mourning. Isaiah removes his sandals — a direct contrast in prophetic signs.
Ezekiel 24:23 repeats the command to keep sandals on during mourning. This contrasts sharply with Isaiah's removal of sandals as a sign of shame.
In Micah 1:8, the prophet goes stripped and naked in lament — a direct parallel to Isaiah's symbolic nakedness as a prophetic sign.
In Jeremiah 13:2, the prophet obeys God's command to put on a loincloth as a symbolic act — a direct parallel to Isaiah's clothing-based sign.
In Jeremiah 27:2, the prophet is told to wear a yoke as a symbolic sign, closely paralleling Isaiah's clothing-related prophetic act.
Hosea 1:2 likewise orders a prophet to undertake an unusual symbolic action to illustrate Israel's unfaithfulness.
Ezekiel 4:5 also involves a symbolic prophetic act — lying on his side for 390 days. Both are commanded signs from God.
Revelation 11:3 describes two witnesses prophesying in sackcloth. Isaiah removes his sackcloth, but both use sackcloth as a prophetic symbol.