A.T. Robertson Commentary Acts 4:11

"He is the stone which was set at nought of you the builders, which was made the head of the corner." — Acts 4:11 (ASV)

Of you the builders (υφ' υμων των οικοδομων). The experts, the architects, had rejected Jesus for their building (Psalms 118:22) as Jesus himself had pointed out (Matthew 21:42; Luke 21:17). This very Rejected Stone God had made the head of the corner (either the highest corner stone right under the roof or the corner stone under the building, Isaiah 28:16) as Jesus showed, as Peter here declares and repeats later (1 Peter 2:6f.).