Matthew 21:42 New English Translation

⁴²Jesus said to them, “Have you never read in the scriptures:

‘The stone the builders rejected has become the cornerstone.^[a]
This is from the Lord, and it is marvelous in our eyes’?^[b]

Matthew 21:42 tn Or “capstone,” “keystone.” Although these meanings are lexically possible, the imagery in Eph 2:20-22 and 1 Cor 3:11 indicates that the term κεφαλὴ γωνίας (kephalē gōnias) refers to a cornerstone, not a capstone.sn The stone the builders rejected has become the cornerstone. The use of Ps 118:22-23 and the “stone imagery” as a reference to Christ and his suffering and exaltation is common in the NT (see also Mark 12:10; Luke 20:17; Acts 4:11; 1 Pet 2:6-8; cf. also Eph 2:20). The irony in the use of Ps 118:22-23 here is that in the OT, Israel was the one rejected (or perhaps her king) by the Gentiles, but in the NT it is Jesus who is rejected by Israel.
Matthew 21:42 sn A quotation from Ps 118:22-23.

New English Translation (NET)