Isaiah 20:3

Then said the LORD, "Whereas my servant Isaiah goeth naked and barefoot, it is a token and signifying of the thing that after three years shall come upon Egypt and Ethiopia.

Isaiah 8:18

But lo, as for me, and the children which the LORD hath given me: we are a token and a wonder in Israel, for the LORD of Hosts' sake, which dwelleth upon the hill of Zion.

Numbers 14:34

after the number of the days in which ye searched out the land forty days, and every day a year: so that they shall bear your unrighteousness forty years, and ye shall feel my vengeance.

Isaiah 18:1-7

Woe be unto the land under the shadow of wings, which is beyond the waters of Ethiopia:

Isaiah 37:9

For there came a rumor, that Tirhakah king of Ethiopia was come forth to war against him. And when the king of Assyria heard that, he sent other messengers to king Hezekiah with this commandment:

Isaiah 43:3

For I am the LORD thy God, the holy one of Israel, thy Saviour. I gave Egypt for thy deliverance, the Ethiopians and the Sabees for thee:

Ezekiel 4:5-6

Nevertheless, I will appoint thee a time to put out their sins and the number of the days: Three hundred and ninety days must thou bear the wickedness of the house of Israel.

Revelation 11:2-3

but the court which is without the temple cast out, and mete it not: for it is given unto the gentiles, and the holy city shall they tread under foot forty two months.

Treasury of Scripture Knowledge

Summary

And the LORD said, Like as my servant Isaiah hath walked naked and barefoot three years for a sign and wonder upon Egypt and upon Ethiopia;

A sign

Bible References

Three

Numbers 14:34
after the number of the days in which ye searched out the land forty days, and every day a year: so that they shall bear your unrighteousness forty years, and ye shall feel my vengeance.
Ezekiel 4:5
Nevertheless, I will appoint thee a time to put out their sins and the number of the days: Three hundred and ninety days must thou bear the wickedness of the house of Israel.
Revelation 11:2
but the court which is without the temple cast out, and mete it not: for it is given unto the gentiles, and the holy city shall they tread under foot forty two months.

A sign

Isaiah 8:18
But lo, as for me, and the children which the LORD hath given me: we are a token and a wonder in Israel, for the LORD of Hosts' sake, which dwelleth upon the hill of Zion.