Isaiah 21:17
And the residue of the number of archers, the mighty men of the children of Kedar, shall be diminished: for the Lord God of Israel hath spoken it.
Cross-reference
In Isaiah 1:20, the same closing formula 'the mouth of the LORD has spoken' appears, underlining the certainty of the judgment declared.
In Isaiah 24:3, the same divine decree formula 'for the LORD has spoken' underlines God's guarantee of judgment—paralleling the certainty of Kedar's reduction.
In Isaiah 17:4, the same theme of a remnant becoming few appears, but applied to Israel's glory waning rather than Kedar's archers.
Jeremiah 49:28 delivers a related oracle against Kedar, showing another prophecy of judgment on the same Arabian tribe.
In Genesis 25:13, Kedar is listed as a son of Ishmael, identifying the tribe that is the subject of the oracle in this verse.
In Numbers 23:19, God's word is reliable—He does not lie. This reinforces that the LORD's spoken judgment over Kedar will surely come to pass.
In 1 Chronicles 1:29, Kedar appears again in the genealogies of Ishmael, providing the same ancestral background for the tribe mentioned here.