Isaiah 28:16

"Behold, I lay in Zion a chief cornerstone, chosen, and precious: He who believes in him will not be disappointed" (2:6) is a formula-introduced citation ("it is contained in Scripture") of Isaiah 28:16 LXX. Verbatim: tithēmi en Siōn lithon... eklekton entimon, and the believer not being put to shame. The keywords 'chosen/precious' also reach back to v.4-5 ('chosen by God, precious').

v.33, formula-marked ('as it is written'): 'Behold, I lay in Zion... a stone... and no one who believes in him will be disappointed/put to shame' quotes Isaiah's cornerstone oracle. Paul fuses it with Isaiah 8:14 to make the laid stone both foundation and stumbling block.

Formula-cited: 'the Scripture says, Whoever believes in him will not be put to shame/disappointed' — a quotation of Isaiah 28:16 (the precious cornerstone in Zion). Paul adds the universalizing 'whoever' (pas). Recurs at Romans 9:33, knitting chapters 9-10 together; high volume and recurrence.

'Christ Jesus himself being the chief cornerstone' draws on 'I lay in Zion a stone, a tested cornerstone, a precious foundation.' Isaiah 28:16 is a recurrent NT messianic stone-text; its foundation/cornerstone vocabulary directly supplies Paul's temple-building imagery.

Paul as 'wise master builder' lays a foundation that no one can replace, echoing Isaiah's word that God lays in Zion a tested, precious cornerstone as foundation. The foundation-laying imagery and the singular God-given foundation cohere strongly; Isaiah 28:16 is a stock messianic foundation text in early Christian usage. The allusion is conceptual here, more explicitly cited elsewhere in the NT.

The 'stone' Christology in v.11 draws on the broader OT stone complex; Isa 28:16's precious cornerstone laid in Zion frequently fuses with Ps 118:22 in early Christian testimonia. No direct citation here, but the cornerstone vocabulary and foundation-of-salvation logic (leading into v.12) cohere with Isaiah's tested stone.

The 'sign spoken against' over which many fall and rise also draws on the tested cornerstone laid in Zion, which becomes the criterion of standing or stumbling. Paired with Isaiah 8 this supplies the stone-of-decision motif; coherence is strong though Luke does not quote it.

"Hope does not put us to shame" (5:5): "whoever believes will not be put to shame" (LXX). Paul quotes this very verse at Romans 9:33 and 10:11; the same shame/faith formula colors his statement here that hope does not disappoint.

The tested cornerstone God lays in Zion belongs to the same stone-testimonia cluster and may inform 'cornerstone' here, reinforcing Psalm 118. Recurrence in the NT stone-catena is strong, but for Luke the Psalm 118 citation carries the load, so the Isaiah 28 contribution is secondary.

Isaiah's tested cornerstone laid in Zion belongs to the same Second-Temple 'stone' testimony cluster that Mark draws on via Psalm 118. While Mark quotes only the Psalm, the messianic-stone catena that early readers heard behind 'head of the corner' typically braided Isaiah 28:16 (precious cornerstone) and Daniel 2 with it, so its availability and coherence support a faint echo.

The 'tested stone' laid in Zion, paired in Pauline usage with Isaiah 8:14, underlies the 'stumbling block' of v.23 and the foundation-stone motif of the proclaimed Christ. The connection is figural and mediated through Paul's wider stone testimonia rather than directly verbal here.

'He who believes will not be put to shame' is a recurrent Pauline shame-text; here it faintly informs the unashamed-testimony theme even without citation. Marked contested.

The 'precious cornerstone' laid in Zion as a sure foundation belongs to the same stone-testimonia cluster (with Ps 118:22) that early Christians combined to interpret Christ as the cornerstone.

'Everyone who believes' / not being put to shame anticipates Paul's later quotation of Isa 28:16 (Rom 9:33; 10:11); 'not ashamed' may already lean on this shame-vindication motif. Faint here, recurrence elsewhere.