Joshua 22:34

Overview - Joshua 22
The two tribes and a half with a blessing are sent home.
10 They build the altar of testimony in their journey.
11 The Israelites are offended thereat.
21 They vindicate their conduct, and give them good satisfaction.
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Joshua 22:34  (King James Version)
And the children of Reuben and the children of Gad called the altar Ed: for it shall be a witness between us that the LORD is God.

i.e, a witness.
The word witness, or testimony, is not found in the common editions of the Hebrew Bible; and is supplied in Italics by our venerable translators, at least in our modern copies; for in the first edition of this translation, it stands in the text without any note of this kind; but it is found in several of Kennicott's and De Rossi's MSS., and also in the Syriac and Arabic. Several also of the early printed editions of the Hebrew Bible have the word {ed,} either in the text or in the margin; and it must be allowed to be necessary to complete the sense. It is very probable that an inscription was put on this altar, signifying the purpose for which it was erected. Thus was this affair most happily terminated.
27 ; 24:27 1 Kings 18:39 ; Isaiah 43:10 ; Matthew 4:10

the Lord is God
Several manuscripts read more emphatically, [yehvh ,]
[hw' ]
[elhym < See definition 0430|>,] {Yehowah, hoo Elohim,}
"Jehovah he is God."