A.T. Robertson Commentary Luke 1:66

"And all that heard them laid them up in their heart, saying, What then shall this child be? For the hand of the Lord was with him." — Luke 1:66 (ASV)

What then (τ αρα). With all these supernatural happenings they predicted the marvellous career of this child. Note Τ,

what , not Τις,

who . Cf. Acts 12:18.

They laid them up (εθεντο, second aorist middle indicative) as Mary did (2:19).The hand of the Lord (χειρ Κυριου). Luke's explanation in addition to the supernatural events. The expression occurs only in Luke's writing (Acts 11:21; Acts 13:11).