Being built upon (epoikodomhqente). First aorist passive participle of epoikodomew, for which double compound verb see 1 Corinthians 3:10 ; 1 Corinthians Co ; 1 Corinthians 2:17 . The foundation (epi twi qemeliwi). Repetition of epi with the locative case. See 1 Corinthians 3:11 for this word. Of the apostles and prophets (ton apostolwn kai prophtwn). Genitive of apposition with qemeliwi, consisting in. If one is surprised that Paul should refer so to the apostles, he being one himself, Peter does the same thing 2 Peter 3:2 ). Paul repeats this language in Ephesians 3:5 . Christ Jesus himself being the chief corner stone (ontw akrogwnianiou autou Cristou Ihsou). Genitive absolute. The compound akrogwniaio occurs only in the LXX (first in Isaiah 28:16 ) and in the N.T. (here, 1 Peter 2:6 ). Liqo (stone) is understood. Jesus had spoken of himself as the stone, rejected by the Jewish builders (experts), but chosen of God as the head of the corner ( Matthew 21:42 ), ei kepalhn gwnia. "The akrogwniaio here is the primary foundation-stone at the angle of the structure by which the architect fixes a standard for the bearings of the walls and cross-walls throughout" (W. W. Lloyd).