Lexicon

H0259 - echad

Strong's: H0259 · BLB lookup Pronunciation: ekh-awd' Part of speech: numeral, used as adjective Greek equivalent (LXX): G1520 - heis, εἷς, "one", direct numerical equivalent. OT occurrences: ~976

Semantic range (Brown-Driver-Briggs)

One (numerical, cardinal), the basic counting sense.
First (ordinal), the first day, the first man, etc.
Each, every (distributive), when used distributively.
A (indefinite article-like), "a man," "a certain one."
Together, alike, when emphasizing collective unity / agreement.
United, single (compound unity), when applied to multiple entities forming one whole.

The semantic flexibility of echad, particularly the compound unity sense (6), is critical for biblical theology. Echad can name a plural-of-united-parts in addition to a strict numerical one.

Theological force, echad vs yachid

Hebrew has two main "one" words; the distinction is theologically loaded:

Term	Strong's	Sense	Implication
אֶחָד (echad)	H0259	One, can be compound or simple unity	Compatible with internal complexity
יָחִיד (yachid)	H3173	Only, solitary, unique, single	Excludes internal plurality

When the Shema (Deuteronomy 6:4) declares YHWH echad, "the LORD is echad", it uses the term that is compatible with internal unity-in-plurality, not the term that strictly excludes it (yachid). Had Moses meant "YHWH is solitary / single in absolute terms with no internal complexity," the natural Hebrew word would have been yachid.

Examples of echad as compound unity in OT:

Genesis 2:24, vehayu lebasar echad, "and they shall become one flesh" (man + woman = echad flesh; clearly two persons forming one unity)
Genesis 1:5, yom echad, "one day" (composed of evening and morning, two halves forming one)
Genesis 11:6, am echad ve-saphah achat, "one people and one language" (composed of many individuals)
Numbers 13:23, eshkol anavim echad, "one cluster of grapes" (a single cluster composed of many grapes)
Ezekiel 37:17, "join them for yourself one to another into one stick" (two sticks become one)
2 Samuel 2:25, "they became one band" (many soldiers, one unit)

The grammar in itself does not prove the Trinity from Deuteronomy 6:4 alone, Jewish exegetes legitimately point out that echad is also the standard Hebrew for strict numerical one (Genesis 2:11 "one of the rivers"). The argument is more modest: echad is compatible with the Trinitarian doctrine; it does not exclude internal-divine-plurality the way yachid would have. The full Trinitarian doctrine is grounded across the canon, but the Shema's word choice is one piece of the case.

The Shema's grammar

Deuteronomy 6:4, Shema Yisrael, YHWH eloheinu, YHWH echad. Multiple translations:

"Hear, O Israel: the LORD our God, the LORD is one." (NASB95, ESV)
"Hear, O Israel: the LORD is our God, the LORD alone." (NRSV alternative, taking echad as "alone")
"Hear, O Israel: the LORD our God is one LORD." (KJV)
"Hear, O Israel! The LORD is our God; the LORD is one!" (NLT)

The standard Christian-Jewish reading: YHWH is the one true God; no other gods are real. This is the Shema's monotheistic confession. The Trinitarian-Christian reading adds: this one God exists in tri-personal unity (Father, Son, Spirit), which the echad of the Shema permits (compatible with internal complexity) without explicitly requiring it.

Notable verses

Numerical / simple

Genesis 1:5, "evening and morning, yom echad"
Genesis 2:11, "the name of the first (echad) is Pishon"
Exodus 12:46, Passover lamb to be eaten in echad bayit (one house)

Compound unity

Genesis 2:24, basar echad (one flesh)
Genesis 11:6, am echad (one people)
Numbers 13:23, eshkol… echad (one cluster of grapes)
Ezekiel 37:17, two sticks become echad (one)

The Shema

Deuteronomy 6:4, YHWH echad, "the LORD is one"
Mark 12:29, Jesus quotes the Shema (the only NT-recorded citation by Jesus, in answer to "what is the greatest commandment")
Galatians 3:20, "God is one"
James 2:19, "you believe that God is one. You do well; the demons also believe, and shudder"

Yachid contrast (for reference, not the same word)

Genesis 22:2, yachid of Isaac (Abraham's only / unique son)
Judges 11:34, yechidah of Jephthah's daughter
Psalm 22:20, yechidati (my only one, my soul)

Patristic / scholarly note

The patristic tradition uniformly affirms strict monotheism while also affirming Trinitarian distinction-in-unity, exactly what echad permits. The patristic argument for Trinity rarely depends solely on echad of Deuteronomy 6:4; it depends on the broader canonical witness (especially NT). But Athanasius (Discourses Against the Arians III.62), Augustine (De Trinitate), and the Cappadocians all note the echad / yachid distinction as consistent with Trinitarian doctrine.

The Jewish-Christian apologetic literature engages this question extensively. Michael Brown (Answering Jewish Objections to Jesus, vol. 2, 2000) gives the most comprehensive Christian apologetic treatment. The Jewish counter-position (e.g., David Klinghoffer, Why the Jews Rejected Jesus, 2005) argues that the Shema's monotheism is incompatible with Trinitarian doctrine. The Christian rejoinder: monotheism (one divine being) is preserved by Trinitarian doctrine (three persons sharing one divine being); echad is precisely the right Hebrew word for this if true.

Verses in this codex

See Obsidian's backlinks pane for every verse page linking here.